Error while running a SQL query

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SQL-Server-2005

SELECT distinct(a.customerid),a.*,b.* from nop_customer a,nop_customerattribute b where a.customerid = b.customerid and a.email like @Value + '%' or a.username like @Value + '%' or (b.[key] like 'FirstName' and b.value like @Value + '%')

When i fire this query in the database i get this error:
Msg 421, Level 16, State 1, Procedure Nop_GetCustomerAttributesBySearch, Line 17
The xml data type cannot be selected as DISTINCT because it is not comparable.

Posted 26-Jun-10 4:35am

Arvinder.aneja

Updated 26-Jun-10 4:51am

Sandeep Mewara

v4

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Sandeep Mewara · Answer 1 · 2010-06-26T04:55:00

"The xml data type cannot be selected as DISTINCT because it is not comparable."
Error itself is self explanatory!

You are trying to use DISTINCT keyword with a field that has a datatype of 'XML'.
SQL does not allow DISTINCT with that field and thus the error.

If actually DISTINCT is needed (based on the way it is formed looks like can be left out), then you need to form the query someother way. Try to use a MAX, TOP or so based on certain field when duplicates are there.