SQL Server -XML 节点不返回多条记录

Question

我试图了解 SQL、XML 节点和交叉应用，我原以为下面的代码会返回 3 行数据，但我只得到一个。我曾认为使用 Cross apply 将查询连接回自身会为我解决这个问题。

谁能告诉我我做错了什么？

提前致谢

丹

DECLARE @XML AS XML;

SELECT @XML = ('<Deal deal_id="821">
  <Application_owner>me</Application_owner>
   <Deal_files>
    <File>file1.doc</File>
    <File>file2.pdf</File>
    <File>file3.xcl</File>
  </Deal_files>
</Deal>
')

select 
    t.n.value('@deal_id', 'int') as [ID],
    f.n.value('(File)[1]','varchar(50)') as [FILENAME]
from 
    @XML.nodes('Deal') t(n)
cross apply 
    t.n.nodes('Deal_files') f(n)

Answer 1

你很亲密

DECLARE @XML AS XML;

SELECT @XML = ('<Deal deal_id="821">
  <Application_owner>me</Application_owner>
   <Deal_files>
    <File>file1.doc</File>
    <File>file2.pdf</File>
    <File>file3.xcl</File>
  </Deal_files>
</Deal>
'
)

Select 
    ID = t.n.value('@deal_id', 'int'),
    FileName = f.n.value('(.)[1]','varchar(50)') 
From  
    @XML.nodes('Deal') t(n)
Cross Apply 
    t.n.nodes('Deal_files/*') f(n)

返回

ID  FileName
--------------
821 file1.doc
821 file2.pdf
821 file3.xcl