Sql query Case statement does not check xml data type column

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Hi all,

i have face one error like SQL Query Select Case statement with evaluate XML data type columns, but i was trying to more than time to get the error like.

ERROR:The XML data type cannot be compared or sorted, except when using the IS NULL operator.

this is my SQL query:-
Select TOP 1000 [AccountsPayable_Content].ItemID,[AccountsPayable_Content].C2SID_SUBJECT, [AccountsPayable_Content].C2SID_CREATOR,
[AccountsPayable_Content].C2SID_DATE, [AccountsPayable_Content].KEYWORDS,CASE [AccountsPayable_Content].C2SID_Notes WHEN ISNULL([AccountsPayable_Content].C2SID_Notes)THEN "0" else "1" end,
[AccountsPayable_Content].LastName" FROM AccountsPayable_Content

Posted 30-Apr-12 4:50am

Karthikeyan Mathiyalagan

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Sandeep Mewara · Answer 1 · 2012-04-30T05:02:00

You cannot group by XML or TEXT columns, you have to first convert it to varchar(max).

Try:

SQL

SELECT 
    TOP 1000 [AccountsPayable_Content].ItemID,
    [AccountsPayable_Content].C2SID_SUBJECT, 
    [AccountsPayable_Content].C2SID_CREATOR,
    [AccountsPayable_Content].C2SID_DATE, 
    [AccountsPayable_Content].KEYWORDS,
    CASE [AccountsPayable_Content].C2SID_Notes 
       WHEN ISNULL(CONVERT(xml,CONVERT(varchar(max),[AccountsPayable_Content].C2SID_Notes)) NotesXML)
       THEN 
            "0" 
       ELSE
            "1" 
    END,
    [AccountsPayable_Content].LastName" 
FROM 
    AccountsPayable_Content

Details here: Limitations of the xml Data Type[^]