pub trait Selectable<DB: Backend> {
    type SelectExpression: Expression;

    // Required method
    fn construct_selection() -> Self::SelectExpression;
}
Expand description

Trait indicating that a record can be selected and queried from the database.

Types which implement Selectable represent the select clause of a SQL query. Use SelectableHelper::as_select() to construct the select clause. Once you called .select(YourType::as_select()) we enforce at the type system level that you use the same type to load the query result into.

The constructed select clause can contain arbitrary expressions coming from different tables. The corresponding derive provides a simple way to construct a select clause matching fields to the corresponding table columns.

Examples

If you just want to construct a select clause using an existing struct, you can use #[derive(Selectable)], See #[derive(Selectable)] for details.

use schema::users;

#[derive(Queryable, PartialEq, Debug, Selectable)]
struct User {
    id: i32,
    name: String,
}

let first_user = users.select(User::as_select()).first(connection)?;
let expected = User { id: 1, name: "Sean".into() };
assert_eq!(expected, first_user);

Alternatively, we can implement the trait for our struct manually.

use schema::users;
use diesel::prelude::{Queryable, Selectable};
use diesel::backend::Backend;

#[derive(Queryable, PartialEq, Debug)]
struct User {
    id: i32,
    name: String,
}

impl<DB> Selectable<DB> for User
where
    DB: Backend
{
    type SelectExpression = (users::id, users::name);

    fn construct_selection() -> Self::SelectExpression {
        (users::id, users::name)
    }
}

let first_user = users.select(User::as_select()).first(connection)?;
let expected = User { id: 1, name: "Sean".into() };
assert_eq!(expected, first_user);

When selecting from joined tables, you can select from a composition of types that implement Selectable. The simplest way is to use a tuple of all the types you wish to select.

use schema::{users, posts};

#[derive(Debug, PartialEq, Queryable, Selectable)]
struct User {
    id: i32,
    name: String,
}

#[derive(Debug, PartialEq, Queryable, Selectable)]
struct Post {
    id: i32,
    user_id: i32,
    title: String,
}

let (first_user, first_post) = users::table
    .inner_join(posts::table)
    .select(<(User, Post)>::as_select())
    .first(connection)?;

let expected_user = User { id: 1, name: "Sean".into() };
assert_eq!(expected_user, first_user);

let expected_post = Post { id: 1, user_id: 1, title: "My first post".into() };
assert_eq!(expected_post, first_post);

If you want to load only a subset of fields, you can create types with those fields and use them in the composition.

use schema::{users, posts};

#[derive(Debug, PartialEq, Queryable, Selectable)]
struct User {
    id: i32,
    name: String,
}

#[derive(Debug, PartialEq, Queryable, Selectable)]
#[diesel(table_name = posts)]
struct PostTitle {
    title: String,
}

let (first_user, first_post_title) = users::table
    .inner_join(posts::table)
    .select(<(User, PostTitle)>::as_select())
    .first(connection)?;

let expected_user = User { id: 1, name: "Sean".into() };
assert_eq!(expected_user, first_user);

let expected_post_title = PostTitle { title: "My first post".into() };
assert_eq!(expected_post_title, first_post_title);

You are not limited to using only tuples to build the composed type. The Selectable derive macro allows you to embed other types. This is useful when you want to implement methods or traits on the composed type.

use schema::{users, posts};

#[derive(Debug, PartialEq, Queryable, Selectable)]
struct User {
    id: i32,
    name: String,
}

#[derive(Debug, PartialEq, Queryable, Selectable)]
#[diesel(table_name = posts)]
struct PostTitle {
    title: String,
}

#[derive(Debug, PartialEq, Queryable, Selectable)]
struct UserPost {
    #[diesel(embed)]
    user: User,
    #[diesel(embed)]
    post_title: PostTitle,
}

let first_user_post = users::table
    .inner_join(posts::table)
    .select(UserPost::as_select())
    .first(connection)?;

let expected_user_post = UserPost {
    user: User {
        id: 1,
        name: "Sean".into(),
    },
    post_title: PostTitle {
        title: "My first post".into(),
    },
};
assert_eq!(expected_user_post, first_user_post);

If you want to avoid nesting types, you can use the Selectable derive macro’s select_expression and select_expression_type attributes to flatten the fields.

use schema::{users, posts};

#[derive(Debug, PartialEq, Queryable, Selectable)]
struct User {
    id: i32,
    name: String,
}

#[derive(Debug, PartialEq, Queryable, Selectable)]
#[diesel(table_name = posts)]
struct PostTitle {
    title: String,
}

#[derive(Debug, PartialEq, Queryable, Selectable)]
struct UserPost {
    #[diesel(select_expression = users::columns::id)]
    #[diesel(select_expression_type = users::columns::id)]
    id: i32,
    #[diesel(select_expression = users::columns::name)]
    #[diesel(select_expression_type = users::columns::name)]
    name: String,
    #[diesel(select_expression = posts::columns::title)]
    #[diesel(select_expression_type = posts::columns::title)]
    title: String,
}

let first_user_post = users::table
    .inner_join(posts::table)
    .select(UserPost::as_select())
    .first(connection)?;

let expected_user_post = UserPost {
    id: 1,
    name: "Sean".into(),
    title: "My first post".into(),
};
assert_eq!(expected_user_post, first_user_post);

Required Associated Types§

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type SelectExpression: Expression

The expression you’d like to select.

This is typically a tuple of corresponding to the table columns of your struct’s fields.

Required Methods§

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fn construct_selection() -> Self::SelectExpression

Construct an instance of the expression

Implementations on Foreign Types§

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, __DB> Selectable<__DB> for (T0, T1)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>, T25: Selectable<__DB>, T26: Selectable<__DB>, T27: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression, <T25 as Selectable<__DB>>::SelectExpression, <T26 as Selectable<__DB>>::SelectExpression, <T27 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>, T25: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression, <T25 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>, T25: Selectable<__DB>, T26: Selectable<__DB>, T27: Selectable<__DB>, T28: Selectable<__DB>, T29: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression, <T25 as Selectable<__DB>>::SelectExpression, <T26 as Selectable<__DB>>::SelectExpression, <T27 as Selectable<__DB>>::SelectExpression, <T28 as Selectable<__DB>>::SelectExpression, <T29 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>, T25: Selectable<__DB>, T26: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression, <T25 as Selectable<__DB>>::SelectExpression, <T26 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>, T25: Selectable<__DB>, T26: Selectable<__DB>, T27: Selectable<__DB>, T28: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression, <T25 as Selectable<__DB>>::SelectExpression, <T26 as Selectable<__DB>>::SelectExpression, <T27 as Selectable<__DB>>::SelectExpression, <T28 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, __DB> Selectable<__DB> for (T0,)where __DB: Backend, T0: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>,

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impl<T0, T1, T2, __DB> Selectable<__DB> for (T0, T1, T2)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>,

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impl<T, DB> Selectable<DB> for Option<T>where DB: Backend, T: Selectable<DB>, Nullable<T::SelectExpression>: Expression,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>, T25: Selectable<__DB>, T26: Selectable<__DB>, T27: Selectable<__DB>, T28: Selectable<__DB>, T29: Selectable<__DB>, T30: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression, <T25 as Selectable<__DB>>::SelectExpression, <T26 as Selectable<__DB>>::SelectExpression, <T27 as Selectable<__DB>>::SelectExpression, <T28 as Selectable<__DB>>::SelectExpression, <T29 as Selectable<__DB>>::SelectExpression, <T30 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>, T18: Selectable<__DB>, T19: Selectable<__DB>, T20: Selectable<__DB>, T21: Selectable<__DB>, T22: Selectable<__DB>, T23: Selectable<__DB>, T24: Selectable<__DB>, T25: Selectable<__DB>, T26: Selectable<__DB>, T27: Selectable<__DB>, T28: Selectable<__DB>, T29: Selectable<__DB>, T30: Selectable<__DB>, T31: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression, <T18 as Selectable<__DB>>::SelectExpression, <T19 as Selectable<__DB>>::SelectExpression, <T20 as Selectable<__DB>>::SelectExpression, <T21 as Selectable<__DB>>::SelectExpression, <T22 as Selectable<__DB>>::SelectExpression, <T23 as Selectable<__DB>>::SelectExpression, <T24 as Selectable<__DB>>::SelectExpression, <T25 as Selectable<__DB>>::SelectExpression, <T26 as Selectable<__DB>>::SelectExpression, <T27 as Selectable<__DB>>::SelectExpression, <T28 as Selectable<__DB>>::SelectExpression, <T29 as Selectable<__DB>>::SelectExpression, <T30 as Selectable<__DB>>::SelectExpression, <T31 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>,

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, __DB> Selectable<__DB> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>, T4: Selectable<__DB>, T5: Selectable<__DB>, T6: Selectable<__DB>, T7: Selectable<__DB>, T8: Selectable<__DB>, T9: Selectable<__DB>, T10: Selectable<__DB>, T11: Selectable<__DB>, T12: Selectable<__DB>, T13: Selectable<__DB>, T14: Selectable<__DB>, T15: Selectable<__DB>, T16: Selectable<__DB>, T17: Selectable<__DB>,

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type SelectExpression = (<T0 as Selectable<__DB>>::SelectExpression, <T1 as Selectable<__DB>>::SelectExpression, <T2 as Selectable<__DB>>::SelectExpression, <T3 as Selectable<__DB>>::SelectExpression, <T4 as Selectable<__DB>>::SelectExpression, <T5 as Selectable<__DB>>::SelectExpression, <T6 as Selectable<__DB>>::SelectExpression, <T7 as Selectable<__DB>>::SelectExpression, <T8 as Selectable<__DB>>::SelectExpression, <T9 as Selectable<__DB>>::SelectExpression, <T10 as Selectable<__DB>>::SelectExpression, <T11 as Selectable<__DB>>::SelectExpression, <T12 as Selectable<__DB>>::SelectExpression, <T13 as Selectable<__DB>>::SelectExpression, <T14 as Selectable<__DB>>::SelectExpression, <T15 as Selectable<__DB>>::SelectExpression, <T16 as Selectable<__DB>>::SelectExpression, <T17 as Selectable<__DB>>::SelectExpression)

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fn construct_selection() -> Self::SelectExpression

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impl<T0, T1, T2, T3, __DB> Selectable<__DB> for (T0, T1, T2, T3)where __DB: Backend, T0: Selectable<__DB>, T1: Selectable<__DB>, T2: Selectable<__DB>, T3: Selectable<__DB>,

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