छोटी तालिका से डुप्लिकेट पंक्तियां हटाएं

एक तेज़ समाधान है

DELETE FROM dups a USING (
      SELECT MIN(ctid) as ctid, key
        FROM dups 
        GROUP BY key HAVING COUNT(*) > 1
      ) b
      WHERE a.key = b.key 
      AND a.ctid <> b.ctid