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how to update a column of selected row in a table (of a same table)...I tried ..but not working...

the query is in below..

UPDATE `billgeneration` SET CollectedBy= ( SELECT `BillCollectionId` FROM   billgeneration  WHERE `PaymentId`=21 LIMIT 0,1 ) WHERE `PaymentId`=22

plz help...
Posted 18-Feb-13 0:49am
Updated 18-Feb-13 1:11am
Tharaka MTR 18-Feb-13 9:05am
why you need "LIMIT 0,1" part?
aravindnass 18-Feb-13 23:26pm
because ,We need 1 row ..( my purpose is update monthly wise ....)..So I need database record of monthly wise...

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