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How to handle IS NULL

Posted on 2011-02-11
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Last Modified: 2012-05-11
I need to join three site address fields together into one string. The code works fine where there a re values in each of the three address fields. However as soon as one of the three fields is blank then the record returned is blank.

I have created this code to try and say if a field is blank put a "" . However it just keeps telling me there is a syntax problem.

CASE WHEN site_address2 IS NULL THEN (' ') ELSE site_address2
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Question by:CMChalcraft
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5 Comments
 
LVL 23

Expert Comment

by:Rajkumar Gs
ID: 34872517
Did you add END ?
CASE WHEN site_address2 IS NULL THEN ' ' ELSE site_address2 END
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LVL 29

Expert Comment

by:Paul Jackson
ID: 34872580
use

COALESCE(Site_address2, ' ')
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LVL 26

Expert Comment

by:Shaun Kline
ID: 34872583
You could also just use the ISNULL(<field>, <value>) function.
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LVL 50

Accepted Solution

by:
Lowfatspread earned 2000 total points
ID: 34872778

use
coalesce(address1+',','')+coalesce(address2+',','')+coalesce(address3,'') as address


coalesce is a function which takes a list of columns/expressions and returns the first non null one from the left....


it is "equivalent" to your case statement...

case when address1+',' is null then '' else address1 end
+case when address2+',' is null then '' else address2 end
+case when address3 is null then '' else address3 end  

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Author Closing Comment

by:CMChalcraft
ID: 34886204
Thanks to everyone who answered. Lowfatspread was the simplest solution. I have never heard of coalesce before.

Regards

Chris C
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