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Using IF EXISTS

Author

Topic

Lemmy44
Starting Member

20 Posts

Posted - 2010-11-04 : 10:07:04

I am trying to populate a table with a series of results, one of them being if a particular value exists (an ID number) in the database, to return a '1', and if it does not exist, then to return a '0'.

I know this is probably a pretty simple process, but I have not had any experience with writing this type of query before.

Thanks,

Lem

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2010-11-08 : 05:24:33

Can you give us more details? Also post the table structure

Madhivanan

Failing to plan is Planning to fail

JonRussell
Starting Member

4 Posts

Posted - 2010-11-09 : 13:33:36

Yes, I think we need more information here, but let me take a guess at what you are asking. Are you asking how to return a result based on the existence of a certain value in a column? If so, I think you are look for the CASE expression. http://msdn.microsoft.com/en-us/library/ms181765.aspx

SELECT TOP 10 
	OrderId,
	AddressExists = 
		CASE 
			WHEN ISNULL(Address1, '') = '' THEN 0
			ELSE 1
		END 
FROM Orders

In this example, a 0 is returned if the Address1 column is NULL, otherwise a 1 is returned.
I hope that answers your question.

Regards,
Jon

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2010-11-10 : 10:23:09

or is it this you want?


SELECT columns...,
CASE WHEN l.IDField IS NULL THEN 0 ELSE 1 END
FROM YourTable t
LEFT JOIN LookupTable l
ON l.IDField=t.Field

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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