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SQL EXCEPT not recognizing differences in capitalization

Posted on 2014-10-17
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Last Modified: 2014-10-17
I am comparing two tables to determine which rows have changed and should be included in a data interface.  Changes in capitalization are not being trapped by the EXCEPT clause. The following example does not return any rows when it should return the row from the left table because it is technically different.

Create table #temp3 (name varchar(max))
Create table #temp4 (name varchar(max))


insert into #temp3 Select 'Paul'
insert into #temp4 Select 'PAUL'

Select * from #temp3
EXCEPT
Select * from #temp4

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Question by:qinformation
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Accepted Solution

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Jim Horn earned 2000 total points
ID: 40387582
The collation on each name column must be set to case sensitive, which since it wasn't explicitly declared in the CREATE TABLE #tmp statements I'm guessing it's taking the collation from the database default.  

To view, in SSMS go to the database and do a right-click:Properties, and eyeball the General tab, Collation property.  Looking at the letters in the second group from the right, _CI_ means case insensitive (i.e. Paul will = PAUL), _CS_ means case sensitive (Paul <> PAUL)
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Author Comment

by:qinformation
ID: 40387596
Excellent, that was it!  Thanks!
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Author Closing Comment

by:qinformation
ID: 40387597
Been doing this for years and years but never had to deal with collation until now.  Always learning!
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LVL 66

Expert Comment

by:Jim Horn
ID: 40387603
Wait until you have to study for Microsoft exams, you learn all sorts of goofy cr*p you never had to deal with before.

Thanks for the grade.  Good luck with your project.  -Jim
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