pub fn count<T: SqlType + SingleValue, expr>(
expr: expr,
) -> count<T, <expr as AsExpression<T>>::Expression>where
expr: AsExpression<T>,
Expand description
Creates a SQL COUNT
expression
As with most bare functions, this is not exported by default. You can import
it specifically as diesel::dsl::count
, or glob import
diesel::dsl::*
§Examples
assert_eq!(Ok(1), animals.select(count(name)).first(connection));