我在数据透视xml之后返回XMLTYPE
<PivotSet>
<item>
<column name = "country">Ukraine</column>
<column name = "population">12345</column>
</item>
<item>
<column name = "country">Germany</column>
<column name = "population">67891</column>
</item>
...
</PivotSet>
我需要获取看起来像的表
Ukraine_population|Germany_population|...
12345 |67891 |...