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Discuss content posted by Amit mishra
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case statement puzzle
17 posts, Page 1 of 2
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case statement puzzle
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amit_adarsh
amit_adarsh
Posted Tuesday, May 25, 2010 9:35 PM
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Comments posted to this topic are about the item
case statement puzzle
Post #927926
Koen Verbeeck
Koen Verbeeck
Posted Wednesday, May 26, 2010 12:50 AM
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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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Post #927974
sharath.chalamgari
sharath.chalamgari
Posted Wednesday, May 26, 2010 1:31 AM
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Nice Question,
as you said once the condition is satisfied it will not look at other statement.
Post #927996
Andrew Watson-478275
Andrew Watson-478275
Posted Wednesday, May 26, 2010 3:25 AM
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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
.
Post #928055
DugyC
DugyC
Posted Wednesday, May 26, 2010 3:29 AM
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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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Post #928059
Ujar
Ujar
Posted Wednesday, May 26, 2010 7:59 AM
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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..
Post #928282
Steve Jones - SSC Editor
Steve Jones - SSC Editor
Posted Wednesday, May 26, 2010 9:13 AM
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This one reminds me of the fundamental concepts I learned in C. 0=false, 1=true.
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Post #928364
ken.trock
ken.trock
Posted Wednesday, May 26, 2010 9:24 AM
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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
Post #928380
brdudley
brdudley
Posted Wednesday, May 26, 2010 10:35 AM
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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"
Post #928451
SQLRNNR
SQLRNNR
Posted Wednesday, May 26, 2010 11:15 AM
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Interesting. I did not know that a case could be written this way as well.
Thanks.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
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Post #928476
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