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conditional where clause

Posted on 2011-03-08
8
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Last Modified: 2012-05-11
Hi,

I want to write something like this

Select * from XYZ
Where
a = 10
b=20
if(c!= null)
 and c = 30

(if c is null then I do not want any condition on 'c' in my where clause)
Please help !!
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Question by:hipal
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8 Comments
 
LVL 77

Accepted Solution

by:
slightwv (䄆 Netminder) earned 143 total points
ID: 35071775
If 'c = 30' in the where clause it cannot be null so no need for the check.

I figure you've tried to simplify the question but think you might have over simplified it.  Can you provide a little more detail?

Are you asking that if a 'paramter' for c is not provided, then do not check column c in the where?

Typically you need dynamic SQL for this but I think you can do it with someting like this, ssuming 30 is a paramter value and not hardcoded:

select * from XYZ
where a=10 and b=20 and c = case when 30 is null then 30 else c end;
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LVL 5

Assisted Solution

by:mayankagarwal
mayankagarwal earned 72 total points
ID: 35071790
select * from xyz where a=10 and b = 20 and(c is null or c = 30);
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LVL 41

Assisted Solution

by:Sharath
Sharath earned 72 total points
ID: 35072307
Check if you want AND or OR operation between the filters.
SELECT * 
  FROM XYZ 
 WHERE a = 10 
       AND b = 20 
       AND NVL(c,30) = 30

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LVL 32

Assisted Solution

by:awking00
awking00 earned 71 total points
ID: 35073029
To help clarify, can you post some sample data and the expected output?
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Assisted Solution

by:subratabiswas
subratabiswas earned 142 total points
ID: 35077830
Select * from XYZ
    Where a = 10
        and b = 20
        and nvl(c, 30) = 30
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LVL 4

Assisted Solution

by:subratabiswas
subratabiswas earned 142 total points
ID: 35077852
Sorry, I withdraw my submission; realized that the exact same solution is provided by Sharath_123
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LVL 77

Expert Comment

by:slightwv (䄆 Netminder)
ID: 35077858
subratabiswas,

How is that different from what Sharath_123 posted?

Please review previous posts before posting.
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LVL 77

Assisted Solution

by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 143 total points
ID: 35077864
You caught me typing...
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