I need to update tblDatabase status field to 'P' where tblnstance.Server_Name does not exist in my subquery. I am getting an error on my table joins.
UPDATE tblDatabase SET tblDatabase.status = 'P'
FROM tblApplication INNER JOIN
tblDBAppRel ON tblApplication.Application_Id = tblDBAppRel.Application_Id INNER JOIN
tblDatabase ON tblDatabase.Database_Id = tblDBAppRel.Database_Id LEFT OUTER JOIN
tblInstance ON tblDatabase.Instance_id = tblInstance.Instance_id
WHERE tblInstance.Server_Name NOT IN
WHERE Server_Name IN (SELECT Server_Name FROM tblMSSQLExtract)
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This is basically a blog post I wrote recently. I've found that SARGability is poorly understood, and since many people don't read blogs, I figured I'd post it here as an article.
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