Question

我正在使用Oracle 11G。我有一个PL / SQL过程，它使用xquery从表中的XMLTYPE列读取XML。 XML包含DEPARTMENT及其SECTIONS的数据。 DEPARTMENT与SECTIONS有一对多的关系，即DEPARTMENT可以有一个或多个SECTIONS，并且可能存在DEPARTMENT没有任何SECTIONS的情况。

XML的结构使得<DATA>标记标识DEPARTMENT及其相应SECTIONS的集合。

XML

<ROWSET> 
<DATA>
 <DEPARTMENT>
  <DEPARTMENT_ID>DEP1</DEPARTMENT_ID>
  <DEPARTMENT_NAME>myDEPARTMENT1</DEPARTMENT_NAME>
 </DEPARTMENT>
 <SECTIONS>
  <SECTIONS_ID>6390135666643567</SECTIONS_ID>
  <SECTIONS_NAME>mySection1</SECTIONS_NAME>
  </SECTIONS>
   <SECTIONS>
  <SECTIONS_ID>6390135666643567</SECTIONS_ID>
  <SECTIONS_NAME>mySection2</SECTIONS_NAME>
  </SECTIONS>
 </DATA>
 <DATA>
 <DEPARTMENT>
  <DEPARTMENT_ID>DEP2</DEPARTMENT_ID>
  <DEPARTMENT_NAME>myDEPARTMENT2</DEPARTMENT_NAME>
 </DEPARTMENT>
 <SECTIONS>
  <SECTIONS_ID>63902</SECTIONS_ID>
  <SECTIONS_NAME>mySection1</SECTIONS_NAME>
  </SECTIONS>
 </DATA>
<DATA>
 <DEPARTMENT>
  <DEPARTMENT_ID>DEP3</DEPARTMENT_ID>
  <DEPARTMENT_NAME>myDEPARTMENT3</DEPARTMENT_NAME>
 </DEPARTMENT>
</DATA>
</ROWSET>

我正在使用的查询是： -

  select d.department_id
       , d.department_name
       , s.sections_id
      , s.sections_name
   from xml_unit_download t
     , xmltable(
         '/ROWSET/DATA'
         passing t.xml_file
         columns
           DEPARTMENT_ID   varchar2(20) path 'DEPARTMENT/DEPARTMENT_ID'
         , DEPARTMENT_NAME varchar2(30) path 'DEPARTMENT/DEPARTMENT_NAME'
         , SECTIONS        xmltype      path 'SECTIONS'
       ) d
     , xmltable(
         '/SECTIONS'
         passing d.sections
         columns
           SECTIONS_ID     varchar2(20) path 'SECTIONS_ID'
        , SECTIONS_NAME   varchar2(30) path 'SECTIONS_NAME'
      ) s
 where
  t.Status = 7

现在这个Xquery没有获取DEP3的结果，我将如何迎合这个？

-------------的修订版 -------------
预期输出

DEPARTMENT_ID        DEPARTMENT_NAME                SECTIONS_ID          SECTIONS_NAME
-------------------- ------------------------------ -------------------- 
DEP1                 myDEPARTMENT1                  6390135666643567     mySection1
DEP1                 myDEPARTMENT1                  6390135666643567     mySection2
DEP2                 myDEPARTMENT2                  63902                mySection1
DEP3                 myDEPARTMENT3

Answer 1

您可以将它们设为外连接：

...
   from xml_unit_download t
     , xmltable(
... 
       ) (+) d
     , xmltable(
...
      ) (+) s
...

给出：

DEPARTMENT_ID        DEPARTMENT_NAME                SECTIONS_ID          SECTIONS_NAME
-------------------- ------------------------------ -------------------- ------------------------------
DEP1                 myDEPARTMENT1                  6390135666643567     mySection1
DEP1                 myDEPARTMENT1                  6390135666643567     mySection2
DEP2                 myDEPARTMENT2                  63902                mySection1
DEP3                 myDEPARTMENT3

PL / SQL唯一列标识来自两个表

1 个答案: