Get all column description/comments from Postgres

Postgres column descriptions

WITH tables 
     AS (SELECT oid, 
                relname AS table 
         FROM   pg_class), 
     columns 
     AS (SELECT ordinal_position AS objsubid, 
                table_name       AS table, 
                column_name      AS column 
         FROM   information_schema.columns) 
SELECT t.table, 
       c.COLUMN, 
       d.description 
FROM   pg_catalog.pg_description d 
       LEFT JOIN tables t 
              ON d.objoid = t.oid 
       LEFT JOIN columns c 
              ON d.objsubid = c.objsubid 
                 AND t.table = c.table 
WHERE  d.objsubid > 0