.NET C# Java Javascript Exception


This week I deployed a new feature and tried it on different SQL databases and was a bit suprised that on one database this error message came up:

Cannot resolve the collation conflict between "Latin1_General_CI_AS" and "SQL_Latin1_General_CP1_CI_AS" in the equal to operation.

This was strange, because - at least in theory - all databases have the same schema and I was sure that each database had the same collation setting.

Collations on columns

Well… my theory was wrong and this SQL statement told me that “some” columns had a different collation.

select sc.name, sc.collation_name from sys.columns sc
inner join sys.tables t on sc.object_id=t.object_id
where t.name='TABLENAME'

As it turns out, some columns had the collation Latin1_General_CI_AS and some had SQL_Latin1_General_CP1_CI_AS. I’m still not sure why, but I needed to do something.

How to change the collation

To change the collation you can execute something like this:


Unfortunately there are restrictions and you can’t change the collation if the column is referenced by any one of the following:

  • A computed column
  • An index
  • Distribution statistics, either generated automatically or by the CREATE STATISTICS statement
  • A CHECK constraint
  • A FOREIGN KEY constraint

Be aware: If you are not in control of the collation or if the collation is “fine” and you want to do this operation anyway, there might be a way to specify the collation in the SQL query.

For more information you might want to check out this Microsoft Docs “Set or Change the Column Collation

Hope this helps!

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