Sql XMLSEQUENCE和空列

下面的查询

WITH TABLE_TEMP AS (
    SELECT '1a' as "column1", '1b' as "column2" FROM DUAL
    UNION ALL
    SELECT '2a' as "column1", null as "column2" FROM DUAL
    UNION ALL
    SELECT '3a' as "column1", '' as "column2" FROM DUAL
)

SELECT VALUE(em) AS "XMLTYPE"
FROM TABLE(XMLSEQUENCE(CURSOR(SELECT * FROM TABLE_TEMP))) em

输出

 XMLTYPE
 ---------------------------------------------------------------
  <ROW><column1>1a</column1><column2>1b</column2></ROW>
  <ROW><column1>2a</column1></ROW>
  <ROW><column1>3a</column1></ROW>

---

我认为XMLSequence已经被弃用了。看：你说得对，我已经编辑了上面的代码来删除XMLSequence。谢谢。我认为XMLSequence已经被弃用了。看：你说得对，我已经编辑了上面的代码来删除XMLSequence。谢谢你。

 XMLTYPE
 ---------------------------------------------------------------
  <ROW><column1>1a</column1><column2>1b</column2></ROW>
  <ROW><column1>2a</column1></ROW>
  <ROW><column1>3a</column1><column2 /></ROW>

SELECT
    VALUE(table_temp) AS "XMLTYPE"
FROM
    XMLTABLE('/ROWSET/ROW' PASSING
        DBMS_XMLGEN.GETXMLTYPE('
            SELECT ''1a'' as "column1", ''1b'' as "column2" FROM DUAL
            UNION ALL
            SELECT ''2a'' as "column1", null as "column2" FROM DUAL
            UNION ALL
            SELECT ''3a'' as "column1", '''' as "column2" FROM DUAL
        ')
    ) table_temp;