This will not work for me as I do not know in advance what columns exist in test_a or test_b. I only know they are called the same (and have the same datatypes).
So is there a dynamic way in which I can generate the INSERT statement given the name of the two tables?
You can write a procedure e.g. in pl/pgsql that will check the column names from a system view like pg_* (I don't remember now) and create the query from the column names and some sql keywords into a text variable. Later you can use EXECUTE for executing such a query from a variable.
