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case statement puzzle


case statement puzzle

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amit_adarsh
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Comments posted to this topic are about the item case statement puzzle
Koen Verbeeck
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Nice question. I didn't know that constants (like 1) could be placed after CASE, so I definately learned something today.



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sharath.chalamgari
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Nice Question,:-)

as you said once the condition is satisfied it will not look at other statement.
Andrew Watson-478275
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I really need to stop being so mistrusting. The right answer was so obvious, I assumed it had to be a trick question and got it wrong Pinch.
DugyC
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Good question that in its simplicity makes you question what seems the obvious answer and think about it more deeply.

According to SQL Books Online, the parser actually checks all conditions and returns the first true condition, if none then returns "else" if its coded otherwise NULL. That's how it seems to be described.

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Ujar
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Really a nice question..

I have got the confusion that, we need to declare the variable name followed by case statement and after that the value followed by when.

Thanks..
Steve Jones
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This one reminds me of the fundamental concepts I learned in C. 0=false, 1=true.

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da-zero (5/26/2010)
Nice question. I didn't know that constants (like 1) could be placed after CASE, so I definately learned something today.


Yeah, same here. Good thing a 4th choice like "error" wasn't supplied with the question or I might have gotten it wrong Exclamation
brdudley
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Steve Jones - Editor (5/26/2010)
This one reminds me of the fundamental concepts I learned in C. 0=false, 1=true.


If you are saying that it chooses the first one because 1 = true, that is not correct. It is using the Case syntax similar to a Switch statement. The Select is equivalent to


Select Case
When @flg = 1 then 'True'
When @flg = 1 then 'False'
Else 'No Flag'


Try changing the constant or the value of @flg. It will result in "No Flag"
SQLRNNR
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Interesting. I did not know that a case could be written this way as well.

Thanks.



Jason AKA CirqueDeSQLeil
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