query postgres delete duplicates
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
query postgres delete duplicates
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
To ignore duplicate keys during 'copy from' in postgresql
create temp table tmp_table on commit drop as select * from brand with no data;
copy tmp_table (name,slug) from '/var/lib/postgresql/data/Brands.csv' DELIMITER ',' csv header;
insert into brand select distinct on (slug) * from tmp_table;
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