If you get this error:
Cannot resolve collation conflict for UNION operation.
You might be pointed to this article:
Where the author describes the fact that there are lots of different collations for different languages e.g.
Now if you are using UK english, the US character set is the same! So why is there an issue?
Well you can see on the preceding link that they actually have different collation properties. How irritating.
English (United Kingdom) = Latin1_General_CI_AS
English (United States) = SQL_Latin1_General_CP1_CI_AS
So you need to change the property of the column to match each other. When you created one of the original tables it might have come from a script that specified the Collation property as the US version.
I searched high and low for how to change the collation property of a table in SQL enterprise manager but could not find it. Anyway this screen grab will show you where it is. You've seen it before just never taken any notice.
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