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Efficiently delete duplicates rows from a table with a set of specific constraints.
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DELETE FROM <table> a USING ( | |
SELECT MIN(ctid) as ctid, var1, var2 | |
FROM <same_table> b | |
GROUP BY 2,3 HAVING COUNT(*) > 1 | |
) b | |
WHERE a.var1 = b.var1 | |
and a.var2 = b.var2 | |
AND a.ctid <> b.ctid |
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