Deletion with Aggregated Data

del-aggregated.sql

WITH dups AS(
	select response_id, answer_id, section
	from meta_answer
	group by response_id, answer_id, section
	having count(1) > 1
)
DELETE FROM meta_answer ma
 WHERE EXISTS (
      SELECT 1 
      FROM   dups
      WHERE  dups.response_id = ma.response_id
      AND    dups.answer_id   = ma.answer_id
      AND    dups.section     = ma.section
 )