pub fn avg<ST: Foldable, expr>(
expr: expr
) -> avg<ST, <expr as AsExpression<ST>>::Expression> where
expr: AsExpression<ST>, Expand description
Represents a SQL AVG function. This function can only take types which are
Foldable.
Examples
diesel::insert_into(numbers)
.values(&vec![number.eq(1), number.eq(2)])
.execute(&conn)?;
let average = numbers.select(avg(number)).get_result(&conn)?;
let expected = "1.5".parse::<BigDecimal>().unwrap();
assert_eq!(Some(expected), average);