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Output of Query


Output of Query

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SQLRNNR
SQLRNNR
SSC Guru
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Thanks for the question.

Jason...AKA CirqueDeSQLeil
_______________________________________________
I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
Posting Performance Based Questions - Gail Shaw
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Sherwin Anderson
Sherwin Anderson
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Group: General Forum Members
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Good question, luckily read the question twice before answering.
Aaron Cutshall
Aaron Cutshall
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Bugger! I hate it when I know the right answer but click on the wrong choice! Angry


...when ye are in the service of your fellow beings ye are only in the service of your God. -- Mosiah 2:17
Revenant
Revenant
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Simple but neat -- thank you!
Ken Wymore
Ken Wymore
SSCrazy Eights
SSCrazy Eights (9.7K reputation)SSCrazy Eights (9.7K reputation)SSCrazy Eights (9.7K reputation)SSCrazy Eights (9.7K reputation)SSCrazy Eights (9.7K reputation)SSCrazy Eights (9.7K reputation)SSCrazy Eights (9.7K reputation)SSCrazy Eights (9.7K reputation)

Group: General Forum Members
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Nice question about something that comes up regularly for me. Especially in writing queries for reporting.
James_B
James_B
SSCommitted
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Group: General Forum Members
Points: 1715 Visits: 739
Great question - unfortunately I got it wrong.

I thought it was too simple so I over compensated and assumed that the code would have "set ansi_nulls off" for the session since it is effectively saying "where col1 = null" rather than "where col1 is null".
OzYbOi d(-_-)b
OzYbOi d(-_-)b
SSCrazy
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Points: 2382 Visits: 778
good question - tks
john.moreno
john.moreno
SSC Eights!
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I'd like to suggest a modification of the answer. What is happening is that the "CASE COLUMN WHEN" syntax does an equity comparision and then uses the result of that comparision, which of course fails with NULL, while the "CASE WHEN x" syntax uses the result of x. Which is why the given query returns null.

So, something like:

The CASE's statement has two alternative syntaxs, "CASE ColumnName WHEN Value" does an equity comparision between the column and the given value. This fails with NULLS unless ANSI_NULLS is off. The other syntax is "CASE WHEN EXPRESSION", which evalutes an expression (which may use any available columns) and uses the result of that expression to determine whether the condition has been met and the associated THEN used.
Evil Kraig F
Evil Kraig F
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Thanks for the question. It was a good caffination check this morning. :-)


- Craig Farrell

Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.

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Rob Schripsema
Rob Schripsema
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Excellent question. Thanks!

Rob Schripsema
Propack, Inc.
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