SQL 联合查询与XML解析实例详解

where applyempid='zhongxun' and a.EBILLNO is not null
and status>5 and status not in(200,100,7000)
and a.APPLYDATE>'2011-01-01'
and a.HT='是'
and cast(d.XMLData as XML).value('(/List/item/SKRXM/text())[1]','NVARCHAR(300)') is null)
union
(select e.EBILLNO,e.EMPNAME,e.APPLYDATE,f.HS_NAME,replace(replace(e.SUMMARY,cast(g.XmlData as XML).value('(/List/item/No/text())[1]',cast(g.XmlData as XML).value('(/List/item/zje/text())[1]',cast(g.XmlData as XML).value('(/List/item/yfje/text())[1]',cast(g.XMLData as XML).value('(/List/item/bcje/text())[1]',cast(g.XMLData as XML).value('(/List/item/URL/text())[1]',cast(g.XMLData as XML).value('(/List/item/Remark/text())[1]',cast(h.XMLData as XML).value('(/List/item/SKRXM/text())[1]','NVARCHAR(300)') as SKRXM,('http://……?sid=3&mid=7281&PID='+e.PID) as bxdljdz
from Ex_Bill as e
left join Ex_System_Cfg as f on(e.BILLSYSTEMID=f.HS_ID and e.DATASYSTEMID=f.SYSTEM_NAME)
left join (select from [10.2.3.39].AspireworkFlow.dbo.RepeaingTable) as g on (g.Keyword='URL' and g.ProcessID=e.PID)
left join (select from [10.2.3.39].AspireworkFlow.dbo.RepeaingTable) as h on (h.Keyword='FKXX_New' and h.ProcessID=e.PID or h.Keyword='FKXX' and h.ProcessID=e.PID)

where applyempid='zhongxun' and e.EBILLNO is not null
and status>5 and status not in(200,7000)
and e.APPLYDATE>'2011-01-01'
and e.HT='是'
and cast(h.XMLData as XML).value('(/List/item/SKRXM/text())[1]','NVARCHAR(300)') is not null)

在写SQL的时候，难点不在于SQL本身，而在于逻辑上，当写出这个SQL以后，发现逻辑也没有那么难了。

就是采用Union把两组都查询出来的表放到一个里面

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