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CROSS APPLY


CROSS APPLY

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Minnu
Minnu
Old Hand
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CROSS APPLY (
   SELECT col = CASE WHEN MAX(col) = MIN(col) THEN MAX(col) ELSE NULL END
)
Andy Hyslop
Andy Hyslop
Say Hey Kid
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And the question is!?

==========================================================================================================================
A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila. Mitch Ratcliffe
Jeff Moden
Jeff Moden
SSC-Forever
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Skanda (10/17/2012)


CROSS APPLY (
   SELECT col = CASE WHEN MAX(col) = MIN(col) THEN MAX(col) ELSE NULL END
)


You REALLY need to get out of the habit of editing your posts. Replacing the question with the answer does no one reading the thread any good. Even you won't have a clue as to what the question actually was in a couple of weeks so you've destroyed your own valuable reference.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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drew.allen
drew.allen
SSCrazy
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Skanda (10/17/2012)


CROSS APPLY (
   SELECT col = CASE WHEN MAX(col) = MIN(col) THEN MAX(col) ELSE NULL END
)


CROSS APPLY applies a "function" to each row of the (virtual) table. In this case, you're calculating a value based on an aggregate of a set consisting of a single record. You can see this by adding a COUNT(*) to your SELECT clause within the CROSS APPLY. Because the set contains a single record, MAX(col) is necessarily equal to MIN(col) except for the case where col is null. Since you're returning a null value in that case, your CROSS APPLY is equivalent to

 CROSS APPLY ( SELECT col )



Drew

J. Drew Allen
Business Intelligence Analyst
Philadelphia, PA
How to post data/code on a forum to get the best help.
How to Post Performance Problems
Make sure that you include code in the appropriate IFCode tags, e.g. [code=sql]<your code here>[/code]. You can find the IFCode tags under the INSERT options when you are writing a post.
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