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tsql NULL record not showing with CASE

Posted on 2013-12-16
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Last Modified: 2013-12-16
My query is not showing my NULL values.  What am I missing?  Thanks!

SELECT        AccessList.ALMYID, AccessList.FirstName, AccessList.LastName, AccessList.ClassStanding, Seminars.SeminarDetails, AccessList.TermGPA, 
                         AccessList.MYCompletedCredits, StudentSeminars.SHasAttended, StudentSeminars.SSeminarID, AccessList.CumulativeGPA, AccessList.CompletedCredits, 
                         AccessList.IsTransfer, Demographics.DEmail, 
						 CASE WHEN (StudentSignature.SSigID IS NULL) 
						 THEN 'No'
						 ELSE 'Yes'
						 END AS Signed
FROM            AccessList INNER JOIN
                         StudentSeminars ON AccessList.ALMYID = StudentSeminars.SMYID INNER JOIN
                         Seminars ON StudentSeminars.SSeminarSelected = Seminars.SeminarID INNER JOIN
                         Demographics ON StudentSeminars.SMYID = Demographics.DMYID INNER JOIN
                         StudentSignature ON StudentSeminars.SMYID = StudentSignature.SSMYID
WHERE (Seminars.SeminarID = @SeminarID)

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Question by:javierpdx
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4 Comments
 
LVL 21

Accepted Solution

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Dale Burrell earned 1600 total points
ID: 39723023
What values are null? And how do you know?

Best guess is because all your joins are inner joins which means that any rows joined on null will mean the entire row doesn't show. You need to use left joins if you want to see null values.
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Expert Comment

by:HuaMinChen
ID: 39723078
Put a relevant value for Null column, like
isnull(col1,'')

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LVL 13

Assisted Solution

by:magarity
magarity earned 400 total points
ID: 39723212
If there is no corresponding record at all in the StudentSignature table then you need to use LEFT OUTER JOIN for it instead of INNER JOIN.  This is what I suspect since your CASE statement is phrased correctly for NULL in that field.
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Author Closing Comment

by:javierpdx
ID: 39723253
Thanks. With LEFT JOIN, the No value did show as "No".
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