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Continue until NULL in SQL Server

Posted on 2013-11-20
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374 Views
Last Modified: 2013-11-20
Hi experts,

I'm using the following to put ';' after each choice in a multi-column query but it's returning NULL even if there are actual results in the first 9 positions but a NULL in Alert10.

SELECT STUFF(
(SELECT  '; '+ SUBSTRING(Alert1,CHARINDEX('^',Alert1)+1,LEN(Alert1))+ '; ' +
 SUBSTRING(Alert2,CHARINDEX('^',Alert2)+1,LEN(Alert2)) + '; ' +
 SUBSTRING(Alert3,CHARINDEX('^',Alert3)+1,LEN(Alert3)) + '; ' +
 SUBSTRING(Alert4,CHARINDEX('^',Alert4)+1,LEN(Alert4)) + '; ' +
 SUBSTRING(Alert5,CHARINDEX('^',Alert5)+1,LEN(Alert5)) + '; ' +
 SUBSTRING(Alert6,CHARINDEX('^',Alert6)+1,LEN(Alert6)) + '; ' +
 SUBSTRING(Alert7,CHARINDEX('^',Alert7)+1,LEN(Alert7)) + '; ' +
 SUBSTRING(Alert8,CHARINDEX('^',Alert8)+1,LEN(Alert8)) + '; ' +
 SUBSTRING(Alert9,CHARINDEX('^',Alert9)+1,LEN(Alert9)) + '; ' +
 SUBSTRING(Alert10,CHARINDEX('^',Alert10)+1,LEN(Alert10))
    FROM tblPatientData
      WHERE CaseNumber = '10163001'
    FOR XML PATH ('')),1,1,'')

I need a query that will stop when it hits or ignore the NULL. I've played with COALESCE but it kept blowing up on me because of syntax errors. So I'm turning to you guys.

Thanks,

JackW9653
0
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Question by:JackW9653
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2 Comments
 
LVL 9

Accepted Solution

by:
Beartlaoi earned 500 total points
ID: 39663988
Use an ISNULL for each expression:
SELECT STUFF(
(SELECT  '; '+ SUBSTRING(Alert1,CHARINDEX('^',Alert1)+1,LEN(Alert1))+ '; ' + 
 ISNULL(SUBSTRING(Alert2,CHARINDEX('^',Alert2)+1,LEN(Alert2)),'') + '; ' +
 ISNULL(SUBSTRING(Alert3,CHARINDEX('^',Alert3)+1,LEN(Alert3)),'') + '; ' +
 ISNULL(SUBSTRING(Alert4,CHARINDEX('^',Alert4)+1,LEN(Alert4)),'') + '; ' + 
 ISNULL(SUBSTRING(Alert5,CHARINDEX('^',Alert5)+1,LEN(Alert5)),'') + '; ' + 
 ISNULL(SUBSTRING(Alert6,CHARINDEX('^',Alert6)+1,LEN(Alert6)),'') + '; ' +
 ISNULL(SUBSTRING(Alert7,CHARINDEX('^',Alert7)+1,LEN(Alert7)),'') + '; ' +
 ISNULL(SUBSTRING(Alert8,CHARINDEX('^',Alert8)+1,LEN(Alert8)),'') + '; ' + 
 ISNULL(SUBSTRING(Alert9,CHARINDEX('^',Alert9)+1,LEN(Alert9)),'') + '; ' + 
 ISNULL(SUBSTRING(Alert10,CHARINDEX('^',Alert10)+1,LEN(Alert10)),'')
    FROM tblPatientData
      WHERE CaseNumber = '10163001'
    FOR XML PATH ('')),1,1,'')

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Author Closing Comment

by:JackW9653
ID: 39664030
That works, thanks for your quick reply.
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