By: carlosdl

carlosdl — Wed, 15 Jul 2009 18:16:25 +0000

How about something like this:

UPDATE auditdata
SET TATCallType=’12′,TATCallUnit=’1′
FROM auditdata a
WHERE EXISTS ( SELECT 1 FROM Auditdata_sms_12 WHERE id = a.id);

With an index on Auditdata_sms_12.id the full table scan of the subselect (if you use where ID in (select…) ) could be avoided.

Comments on: slow update Query(Primary Key)