pub fn sum<ST: Foldable, expr>(
expr: expr
) -> sum<ST, <expr as AsExpression<ST>>::Expression> where
expr: AsExpression<ST>, Expand description
Represents a SQL SUM function. This function can only take types which are
Foldable.
Examples
assert_eq!(Ok(Some(12i64)), animals.select(sum(legs)).first(&connection));