XmlIndex subsetting question

Version database please?

And question: is there still a single node "empno" by the document?

The following works for me.

Make sure you pass the link as string variable, no number (unless you create an additional digital index on the VALUE of path):

SQL> select *
  2  from emp
  3  where xmlexists('//empno[.=$empno]'
  4          passing empinfo
  5                , '7777' as "empno"
  6        )
  7  ;

Execution Plan
----------------------------------------------------------
Plan hash value: 1962240707

-------------------------------------------------------------------------------------------------------------------
| Id  | Operation                        | Name                           | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                 |                                |     1 |   145 |     5  (20)| 00:00:01 |
|   1 |  NESTED LOOPS                    |                                |     1 |   145 |     5  (20)| 00:00:01 |
|   2 |   VIEW                           | VW_SQ_1                        |     1 |    12 |     3   (0)| 00:00:01 |
|   3 |    HASH UNIQUE                   |                                |     1 |    47 |            |          |
|   4 |     NESTED LOOPS                 |                                |       |       |            |          |
|   5 |      NESTED LOOPS                |                                |     1 |    47 |     3   (0)| 00:00:01 |
|   6 |       TABLE ACCESS BY INDEX ROWID| X$PT72R2I5S5V9A9VE0GOACG0GKWIG |     1 |    12 |     2   (0)| 00:00:01 |
|*  7 |        INDEX RANGE SCAN          | X$PR72R2I5S5V9A9VE0GOACG0GKWIG |     1 |       |     1   (0)| 00:00:01 |
|*  8 |       INDEX RANGE SCAN           | SYS166546_SUBSET_XM_VALUE_IX   |     7 |       |     0   (0)| 00:00:01 |
|*  9 |      TABLE ACCESS BY INDEX ROWID | SYS166546_SUBSET_XM_PATH_TABLE |     1 |    35 |     1   (0)| 00:00:01 |
|  10 |   TABLE ACCESS BY USER ROWID     | EMP                            |     1 |   133 |     1   (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   7 - access(SYS_PATH_REVERSE("PATH")>=HEXTORAW('021FD8')  AND
              SYS_PATH_REVERSE("PATH")
Alternatively, if each doc contains at most one occurrence of 'empno', you can add a virtual column that retrieves and create an index on this column:
SQL> alter table emp add empno number generated always as (
  2    xmlcast(xmlquery('//empno' passing empinfo returning content) as number)
  3  )
  4  virtual ;

Table altered.

SQL>
SQL> create index emp_empno_i on emp (empno);

Index created.

SQL> select * from emp where empno = 7777;

Execution Plan
----------------------------------------------------------
Plan hash value: 1114809652

-------------------------------------------------------------------------------------------
| Id  | Operation                   | Name        | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |             |     1 |   133 |     2   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP         |     1 |   133 |     2   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | EMP_EMPNO_I |     1 |       |     1   (0)| 00:00:01 |
-------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("EMPNO"=7777)
 
         
 
         
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 Tags: Database
 
         
         
 
          
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