我想要生成
SELECT DISTINCT
P.DOMAIN_ID,P.SOURCE_SYSTEM_ID
FROM EDW.dbo.DOMAIN_VALUE AS P
WHERE P.ID = 4
AND CURRENT_FLAG = 'Y'
EXCEPT
( SELECT F.DOMAIN_ID,F.SOURCE_SYSTEM_ID
FROM EDW.dbo.DOMAIN AS F
WHERE F.ID = 4
AND F.CURRENT_FLAG = 'Y'
)
FOR XML PATH('DOMAIN'),ROOT('DOMAIN_VALUE')
“结果”选项卡中的XML输出值为
<REFERENCE_DOMAIN_VALUE>
<REFERENCE_DOMAIN>
<REFERENCE_DOMAIN_ID>10799</REFERENCE_DOMAIN_ID>
<REFERENCE_SOURCE_SYSTEM_ID>7452-001</REFERENCE_SOURCE_SYSTEM_ID>
</REFERENCE_DOMAIN>
</REFERENCE_DOMAIN_VALUE>
现在我需要将此XML转换为varchar(max),但结果必须相同.
解决方法
只需将其子查询为标量值并进行转换即可.这里的技巧是子查询中的FOR XML和顶部的EXCEPT不混合,因此首先查询EXCEPT部分.
SELECT CONVERT(varchar(max),(
SELECT * FROM (
SELECT DISTINCT P.DOMAIN_ID,P.SOURCE_SYSTEM_ID
FROM EDW.dbo.DOMAIN_VALUE AS P
WHERE P.ID = 4 AND CURRENT_FLAG = 'Y'
EXCEPT (
SELECT F.DOMAIN_ID,F.SOURCE_SYSTEM_ID
FROM EDW.dbo.DOMAIN AS F
WHERE F.ID = 4 AND F.CURRENT_FLAG = 'Y' )
) I
FOR XML PATH('DOMAIN'),ROOT('DOMAIN_VALUE')
))
