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SQL code:

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SELECT
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±í˵Ã÷=CASE WHEN a.colorder = 1 THEN isnull(f.value, '') ELSE '' END ,
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Mssql2005 xml ²éѯ ʹÓà exist - .NET¼¼Êõ / C#

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select case null
when '' then '1' 
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