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Case statement with <> condition


Case statement with <> condition

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Megha P
Megha P
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I have query something like this ..i haven't posted here original quary
   IF (@p_flag = 1)
BEGIN
SELECT ..
...
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE T.moveFlag = 26
END
ELSE
BEGIN
SELECT ..
...
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE T.moveFlag <> 26
END



I come up with this
 SELECT ..
...
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE 1 = CASE WHEN @p_flag = 1
THEN CASE WHEN moveFlag = 26
THEN 1
ELSE 0
END
ELSE CASE WHEN moveFlag <> 26
THEN 1
ELSE 0
END
END


Any other optimized way to make this in one statement?
Sean Lange
Sean Lange
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How about this?


SELECT [Columns]
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE CASE @p_flag
WHEN 1 THEN moveFlag = 26
ELSE moveFlag > 26 OR moveFlag < 26
END



Notice I modified the second predicate to two portions. This is to allow any index on moveFlag to be a seek instead of a scan.

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Lowell
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well, the WHERE statement is still a "catch all" query, but isn't this functionally identical?


WHERE 1 = CASE WHEN @p_flag = 1 OR moveFlag = 26
THEN 1
ELSE 0
END



Lowell

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Sean Lange
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Lowell (5/7/2014)
well, the WHERE statement is still a "catch all" query, but isn't this functionally identical?


WHERE 1 = CASE WHEN @p_flag = 1 OR moveFlag = 26
THEN 1
ELSE 0
END



Wouldn't this not return any rows when @p_flag = 0? This would eliminate all the rows in the original second query.

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David Burrows
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Well subject to indexes and performance testing I do this

;with cte (ID) AS (
SELECT ID
FROM Test1 T1
WHERE @p_flag = 1
AND T1.moveFlag = 26
UNION ALL
SELECT ID
FROM Test1 T1
WHERE @p_flag = 0
AND T1.moveFlag <> 26)
SELECT ..
FROM cte T1
JOIN Test2 T2 ON T1.ID = T2.ID




Far away is close at hand in the images of elsewhere.

Anon.


gbritton1
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Sean Lange (5/7/2014)
How about this?


SELECT [Columns]
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE CASE @p_flag
WHEN 1 THEN moveFlag = 26
ELSE moveFlag > 26 OR moveFlag < 26
END



how did you make this work? I copied and pasted this into SSMS, set up test tables but it won't parse. I get:

[quote]Msg 102, Level 15, State 1, Line 3
Incorrect syntax near '='.

Sean Lange
Sean Lange
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gbritton1 (5/7/2014)
Sean Lange (5/7/2014)
How about this?


SELECT [Columns]
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE CASE @p_flag
WHEN 1 THEN moveFlag = 26
ELSE moveFlag > 26 OR moveFlag < 26
END



how did you make this work? I copied and pasted this into SSMS, set up test tables but it won't parse. I get:

[quote]Msg 102, Level 15, State 1, Line 3
Incorrect syntax near '='.



Ahh you are correct. It will not work as posted. This is some fallout from not having ddl and sample data to work with.

This should work...of course it is untested for the same reason I didn't test my previous post.


WHERE (@p_flag = 1 AND moveFlag = 26)
OR (@p_flag <> 1 --if this is a bit I would use = 0 instead of <> 1
AND moveFlag > 26 OR moveFlag < 26)



This is similar to a catch-all type of query. Gail has an excellent article about that type of query here. http://sqlinthewild.co.za/index.php/2009/03/19/catch-all-queries/

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

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Cross Tabs and Pivots, Part 1 – Converting Rows to Columns
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs
Understanding and Using APPLY (Part 1)
Understanding and Using APPLY (Part 2)
gbritton1
gbritton1
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Sean Lange (5/7/2014)
gbritton1 (5/7/2014)
Sean Lange (5/7/2014)
How about this?


SELECT [Columns]
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE CASE @p_flag
WHEN 1 THEN moveFlag = 26
ELSE moveFlag > 26 OR moveFlag < 26
END



how did you make this work? I copied and pasted this into SSMS, set up test tables but it won't parse. I get:

[quote]Msg 102, Level 15, State 1, Line 3
Incorrect syntax near '='.



Ahh you are correct. It will not work as posted. This is some fallout from not having ddl and sample data to work with.

This should work...of course it is untested for the same reason I didn't test my previous post.


WHERE (@p_flag = 1 AND moveFlag = 26)
OR (@p_flag <> 1 --if this is a bit I would use = 0 instead of <> 1
AND moveFlag > 26 OR moveFlag < 26)



This is similar to a catch-all type of query. Gail has an excellent article about that type of query here. http://sqlinthewild.co.za/index.php/2009/03/19/catch-all-queries/



...might want parens arount that inner OR condition, I spose
Sean Lange
Sean Lange
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gbritton1 (5/7/2014)
Sean Lange (5/7/2014)
gbritton1 (5/7/2014)
Sean Lange (5/7/2014)
How about this?


SELECT [Columns]
FROM Test1 T1
INNER JOIN Test2 T2 ON T1.ID = T2.ID
WHERE CASE @p_flag
WHEN 1 THEN moveFlag = 26
ELSE moveFlag > 26 OR moveFlag < 26
END



how did you make this work? I copied and pasted this into SSMS, set up test tables but it won't parse. I get:

[quote]Msg 102, Level 15, State 1, Line 3
Incorrect syntax near '='.



Ahh you are correct. It will not work as posted. This is some fallout from not having ddl and sample data to work with.

This should work...of course it is untested for the same reason I didn't test my previous post.


WHERE (@p_flag = 1 AND moveFlag = 26)
OR (@p_flag <> 1 --if this is a bit I would use = 0 instead of <> 1
AND moveFlag > 26 OR moveFlag < 26)



This is similar to a catch-all type of query. Gail has an excellent article about that type of query here. http://sqlinthewild.co.za/index.php/2009/03/19/catch-all-queries/



...might want parens arount that inner OR condition, I spose


Only if we want it to be correct. ;-) Good catch!!!

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Moden's splitter.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs
Understanding and Using APPLY (Part 1)
Understanding and Using APPLY (Part 2)
Megha P
Megha P
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Sean Lange's code works perfectly ..with index seek

WHERE (@p_flag = 1 AND moveFlag = 26)
OR (@p_flag <> 1 --if this is a bit I would use = 0 instead of <> 1
AND moveFlag > 26 OR moveFlag < 26)

Thank you all...
Go


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