Collation conflict when naming columns

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Hi,

I am encountering a (weird?) problem with a collation conflict (MSSQL2008).

A simplified example of my query:

SQL

SELECT X.*
      ,Y.Field3
FROM (SELECT Field1
            ,Field2
      FROM TABLE1) X
      LEFT OUTER JOIN TABLE2 Y ON X.Field1 = Y.Field1

This works nicely (with the X.*), but when I specifically write out the columns of table X:

SQL

SELECT X.Field1
      ,X.Field2
      ,Y.Field3
FROM (SELECT Field1
            ,Field2
      FROM TABLE1) X
      LEFT OUTER JOIN TABLE2 Y ON X.Field1 = Y.Field1

I get a collation conflict error (Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Finnish_Swedish_CI_AS" in the UNION operation)

Can someone explain to me how specifically naming the columns can cause the conflict, or how using the * "solves" this conflict ?

Regards,
Johan

Posted 29-Dec-14 0:17am

Johan Hakkesteegt

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Maciej Los · Accepted Answer · 2014-12-29T00:30:00

Replace:

SQL

SELECT X.Field1
      ,X.Field2
      ,Y.Field3
FROM (SELECT Field1
            ,Field2
      FROM TABLE1) X
      LEFT OUTER JOIN TABLE2 Y ON X.Field1 = Y.Field1

with:

SQL

SELECT X.Field1
      ,X.Field2
      ,Y.Field3
FROM TABLE1 AS X LEFT OUTER JOIN TABLE2 Y ON X.Field1 = Y.Field1

You don't need subquery to join two tables!

Secondly, have a look here: Collation Precedence (Transact-SQL)[^] to resolve collation problem/issue.