pub fn max<C: ColumnKey>( _column: Column<C>, ) -> Keyed<Agg<Max, C>, Cons<C::Table, Nil>, <C::Sql as WrapNullable<MaybeNull>>::Output>where C::Sql: Ordered, <C::Sql as WrapNullable<MaybeNull>>::Output: SqlType,
max(column). NULL over zero rows.
max(column)