Dynamic column in SELECT statement postgres

Question

I am quite new to the postgresql.

what is the best way to achieve this?

SELECT get_columns() 
  FROM table_name;

get_columns(

Answer 1

I think your biggest problem is that you need to return rows in a way that PostgreSQL can understand. This means basically, you can return a refcursor or you can return a consistent set of data types. I prefer the latter because it makes the system a bit more consistent from a programming perspective and there are some advanced directions you can take that but I can see the other way too.