The Text Data Type Cannot Be Selected As DISTINCT Because It Is Not Comparable.

May 28, 2008

I'm having a problem building a query for an application I'm writing. Basically, there are a bunch of records in a table, and some of them may have the same identifier code. I only want one of each identifier code. The table looks like this:

Memo
---------
Msg_Identifier varchar(60)
Memo_ID int (pk)
Subject varchar(64)
Message text
Priority int
Deleted int


My query:

SELECT DISTINCT Msg_Identifier, Memo_ID, Subject, Message, Priority FROM Memo WHERE Deleted = '0'



When I run this query, I get "The text data type cannot be selected as DISTINCT because it is not comparable."

I only want Msg_Identifier to be the distinct field, and it's obviously not set up as text. I've used SELECT DISTINCT in the past but I don't ever recall hitting an issue like this. What's the best way to do it?

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Ntext Data Type Cannot Be Selected As DISTINCT

Mar 3, 2008

Hello,
When I am using DISTINCT in the SELECT clause for a table having a column of datatype "ntext" in SQL 2000 as well SQL 2005, it fails giving the error as "ntext data type cannot be selected as DISTINCT". This is coz
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But I am able to insert into a temporary table having a column whose datatype is nvarchar) using this SELECT clause in SQL 2000. Please advice me how this happens. If I am not worng, implicit conversion has happened. But this insert fails raising the same error in SQL 2005. Please help me to find the difference
thanks in advance!

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The text data type cannot be selected as DISTINCT because it is not comparable.

DECLARE @c NVARCHAR(MAX)
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[Code] ....

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