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SubQuery Performance

Why would you do this?
select distinct(hostname),
(select count(*) as criticalCnt
from @temp where severity_guid='0168A833-1732-411E-8205-C2F6CD91737D'
and hostname=t.hostname
group by hostname),
(select count(*) as criticalCnt...

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2010-07-16

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Question of the Day

A Quick Restore

While doing some testing of an application, I wanted to reset my environment after doing some testing with this code: 

USE DNRTest

BACKUP DATABASE DNRTest TO DISK = 'dnrtest.bak'
GO
/*
Bunch of stuff tested here
*/RESTORE DATABASE DNRTest FROM DISK = 'dnrtest.bak' WITH REPLACE
What happens if this runs, assuming the "bunch of stuff" isn't anything affecting the instance.

See possible answers