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Using a SELECT statement inside of a CASE

Posted on 2016-11-16
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I have a table variable called @Results with a bunch of data in it.  One of the columns is called Info.

I'm trying to update the data in this column using the following:

                        Set Info =

                        CASE WHEN [@Results].Info = 'Other (Please explain)'
                        THEN
                        ('Other - ' + SELECT InformationTrackings.OtherInformation FROM InformationTrackings
                                WHERE  InformationTrackings.TrackingId = [@Results].Id)
                        ELSE Info
                        END

This seems to work OK if I leave off the SELECT part of the statement, and just have 'Other-'.  But when I add the SELECT part it doesn't seem to be the correct syntax.
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Question by:delmarvamonkey
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5 Comments
 
LVL 51

Expert Comment

by:Vitor Montalvão
ID: 41889955
If that returns only one row make the concatenation inside the SELECT:
CASE WHEN [@Results].Info = 'Other (Please explain)'
       THEN SELECT 'Other - ' + InformationTrackings.OtherInformation 
            FROM InformationTrackings 
            WHERE  InformationTrackings.TrackingId = [@Results].Id
        ELSE Info
END

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LVL 29

Expert Comment

by:Pawan Kumar
ID: 41889972
could you please post the entire query.
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Author Comment

by:delmarvamonkey
ID: 41889978
I'm getting an error on "SELECT" and "[@Results].Id" and "ELSE"

SELECT says "incorrect syntax near SELECT"
[@Results].Id says The multi part identifier could not be bound
ELSE says Incorrect syntax near ELSE

                        UPDATE @Results

                        SET Info =

                        CASE WHEN [@Results].Info = 'Other (Please explain)'
                                 THEN SELECT 'Other - ' + InformationTrackings.OtherInformation
                                          FROM InformationTrackings
                                          WHERE  InformationTrackings.MedicTrackingId = [@Results].Id
                                    ELSE Info
                        END
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LVL 51

Accepted Solution

by:
Vitor Montalvão earned 2000 total points
ID: 41889995
Then you don't even need the CASE statement. It's more simple than that:
UPDATE R
SET R.Info = 'Other - ' + InformationTrackings.OtherInformation 
FROM @Results R
	INNER JOIN InformationTrackings on InformationTrackings.MedicTrackingId = R.Id
WHERE R.Info = 'Other (Please explain)'

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LVL 51

Expert Comment

by:Vitor Montalvão
ID: 41889996
And like the above solution you'll only update the rows that really need to be updated. Much faster.
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