No join in the query involving 2 tables

Friends,
I saw a strange plan for one query in TESTING DB today. Although 2 tables are involved i dont see any join , NL/HJ/SMJ !!
Can you please tell why this might be happening?
Note: i am not facing any performance issue but curious to know what type of optimization oracle is doing here.
It would be great if you could direct me the relevant link in the documentation.
Query text and plan :
SELECT FIRST_NAME
FROM CAMPA.TABLE_A
WHERE NAME_ID =
          (SELECT NAME_ID
             FROM CAMPA.TABLE_B
            WHERE ban=:b1);
Plan hash value: 311916800
| Id | Operation                             | Name                  | Rows | Bytes | Cost | Pstart| Pstop |
|   0 | SELECT STATEMENT                      |                       |     1 |    12 |     2 |       |       |
|   1 | PARTITION RANGE SINGLE               |                       |     1 |    12 |     1 |   KEY |   KEY |
|   2 |   TABLE ACCESS BY LOCAL INDEX ROWID   | TABLE_A               |     1 |    12 |     1 |   KEY |   KEY |
|* 3 |    INDEX UNIQUE SCAN                  | TABLE_A_PK            |     1 |       |     1 |   KEY |   KEY |
|   4 |     PARTITION RANGE SINGLE            |                       |     2 |    30 |     1 |   KEY |   KEY |
|   5 |      TABLE ACCESS BY LOCAL INDEX ROWID| TABLE_B               |     2 |    30 |     1 |   KEY |   KEY |
|* 6 |       INDEX RANGE SCAN                | TABLE_B_2IX           |     2 |       |     1 |   KEY |   KEY |
Predicate Information (identified by operation id):
   3 - access("NAME_ID"= (SELECT "NAME_ID" FROM "CAMPA"."TABLE_B" "TABLE_B"
              WHERE "BAN"=TO_NUMBER(:B1)))
   6 - access("BAN"=TO_NUMBER(:B1))
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE    11.1.0.7.0      Production
TNS for HPUX: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production

With equality condition can i get NL/HJ join where the outer row source comes from the subquery?
What condition/pre-requisite of NL/HJ join is not met in this case?Don't use an equality condition with a subquery - this implicitly makes available to the CBO an optimisation strategy that can only be used if the subquery is guaranteed to return a single row.
So either use IN rather than = or use a JOIN not a SUBQUERY.
It's a bit of a strange question.
How do I remove this optimisation?
Take away the features that make that optimisation a possibility.
Edited by: Dom Brooks on May 13, 2013 2:20 PM

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<pre>
Operation Object Name Rows Bytes Cost Object Node In/Out PStart PStop
SELECT STATEMENT Optimizer Mode=RULE
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<pre>
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physical reads 211
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bytes sent via SQL*Net to client 1431124
bytes received via SQL*Net from client 49632
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sorts (disk) 0
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I need to make a change in already created query generating a report concerning Billing documents. Tables which are being used in there are VBRK, VBRP, VBPA & KNA1.
Now, I would like to add Purchase Order number as field in Field Group in related Infoset in SQ02.
The issue is when I include table VBKD field VBKD-BKSTD to fetch PO number and join it in infoset, it does get joined but the actual query does not work in SQ00 or SQ01 after getting this change done in infoset.
Can you please suggest if I am doing something wrong in joining the tables or should I try joining some other table to get this requirement??
Kindly help and thanks in advance for your suggestions!!
Regards
Bawa

Hi Shiva,
The issue is that I cannot use the field VBRP-AUBEL as it contains the document number of referenced Sales Document which is sales order type document number in my case.
Kindly suggest if I am doing something wrong in joining or do I have take care of some steps involving joining of tables??
Thanks
Bawa
Edited by: Bawa Bawa on Sep 23, 2009 9:44 PM
Edited by: Bawa Bawa on Sep 24, 2009 9:32 AM

No join in the query involving 2 tables

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