Function diesel::dsl::sum

source · 
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));