Use multiple conflict_target in ON CONFLICT clause

Question

I have two columns in table col1, col2, they both are unique indexed (col1 is unique and so is col2).

I need at insert into this table, u

Answer 1

1. Create a constraint (foreign index, for example).

OR/AND

2. Look at existing constraints (\d in psq).
3. Use ON CONSTRAINT(constraint_name) in the INSERT clause.