CONCAT_NULL_YIELDS_NULL [on/off]
2016-11-08 10:50
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SET CONCAT_NULL_YIELDS_NULL OFF SELECT TOP 1000 [ActivityDestID], [RolesOrgIdList], CONVERT(varchar(10),[ActivityDestID])+ [RolesOrgIdList] AS b FROM [BPM].[dbo].[ActivityDest] SET CONCAT_NULL_YIELDS_NULL { ON | OFF } RolesOrgIdList为null 例如: 将 SET 选项 设置为 ON 之后, 表达式 b 返回的值是 NULL。 而将 设置为 OFF 之后,该表达式得出的结果却是 CONVERT(varchar(10),[ActivityDestID])。
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