Adding and displaying comments in Postgres SQL does not work

Subj.

Comments of tables or what?

Did you search the bugtracker for a report of that issue?

If in a query to display the table structure use instead

com.description AS column_comment

use

col_description(c.oid, a.attnum) AS column_comment

Comments will be displayed

col_description(pgc.oid, a.attnum) AS column_comment

error in post

Could it be you're not using the latest build? I fixed PostgreSQL table comments recently for issue #763.

However, you could really write more detailed about that error, server version, and write in whole sentences so others can better read.