ARRAY[expr1, expr2, ...] Constructs a SQL ARRAY literal from the provided expression arguments. All arguments must be of the same type. ARRAY_APPEND(arr, expr) Appends the expression to the array. The ...

I wonder does anybody use group_concat or equivalents to make the algorithms more efficient with many to many association? From my point of view it helps a lot in some use cases, but raw SQL code is ...