On Jun 16, 2012, at 1:11 PM, Bill House wrote: > md5sum may be duplicated and I am trying to mark the column "del" of the > redundant records leaving one unmarked. > > Here is one variation of the syntax I have tried on one group: > > WITH batch AS (select * from files_test where > md5sum = '0010a3e4cc6cb8623c014f5bb95b5be1' > ORDER BY path DESC OFFSET 1) > UPDATE batch SET del = False; In Update clause you have to use tablename. Syntax would be something like given below: WITH batch as (SELECT columname,columname FROM tablename) UPDATE file_test set del=false FROM batch where file_test.columname=batch.columnname ... Also AFAIU, you want to set del flag to false for duplicate md5 then you can achieve this with Normal UPDATE. Something like given below: UPDATE file_test set del=false WHERE CTID not in (SELECT MIN(ctid) FROM file_test WHERE md5sum='0010a3e4cc6cb8623c014f5bb95b5be1'; Thanks & Regards, Vibhor Kumar EnterpriseDB Corporation The Enterprise PostgreSQL Company Blog: http://vibhork.blogspot.com -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
