Postgresql GROUP_CONCAT equivalent?

Question

I have a table and I\'d like to pull one row per id with field values concatenated.

In my table, for example, I have this:

TM67 | 4  | 32556
TM67 | 9         


        

Answer 1

and the version to work on the array type:

select
  array_to_string(
    array(select distinct unnest(zip_codes) from table),
    ', '
);