Should the column name in the not in clause be indexed?

Hi, Everyone,
I am having oracle database version 11.0.1.6 on windows server 2003 R2.
I have a query like this:
Select * from icm
where customer_no not in (select customer_no from icm_pre);
I would like to know whether we should index the customer_no column in icm_pre table too? I have indexed customer_no column in icm.
Will there be a better performance if i index both the columns in the 2 tables?
Thanks

user10636796 wrote:
| Id | Operation                      | Name                           | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | INSERT STATEMENT               |                                |     1 |   147 |   764   (1)| 00:00:10 |
|   1 | LOAD TABLE CONVENTIONAL       | ICM_UPSEL_0_ALL                |       |       |            |          |
|   2 |   HASH GROUP BY                |                                |     1 |   147 |   764   (1)| 00:00:10 |
|   3 |    NESTED LOOPS                |                                |       |       |            |          |
|   4 |     NESTED LOOPS               |                                |     1 |   147 |   763   (1)| 00:00:10 |
|* 5 |      HASH JOIN RIGHT ANTI NA   |                                |     1 |    78 |   687   (1)| 00:00:09 |
|   6 |       TABLE ACCESS FULL        | ICM_UPSEL_1_ALL                | 18556 |   235K|    68   (0)| 00:00:01 |
|* 7 |       TABLE ACCESS FULL        | ICM_UPSEL_MIN_PRDIFF_0         |   223K|    13M|   618   (1)| 00:00:08 |
|* 8 |      INDEX RANGE SCAN          | PRICE_DIFF_IDX                 |    84 |       |     3   (0)| 00:00:01 |
|* 9 |     TABLE ACCESS BY INDEX ROWID| ICM_PRE                        |     1 |    69 |    76   (0)| 00:00:01 |
Predicate Information (identified by operation id):
5 - access("A"."PR_CODE_BBL"="PR_CODE_BBL")
7 - filter("A"."FLAG"=0 AND "A"."PRICE_DIFF">0 AND "A"."SCORE">=0.5 AND "A"."PRICE_DIFF"<=10)
8 - access("A"."PRICE_DIFF"="B"."PRICE_DIFF")
filter("B"."PRICE_DIFF"<=10 AND "B"."PRICE_DIFF">0)
9 - filter("B"."SCORE">=0.5 AND "B"."FLAG"=0 AND "A"."CUSTOMER_NO"="B"."CUSTOMER_NO" AND
"A"."PR_CODE_BBL"="B"."PR_CODE_BBL" AND "A"."SCORE"="B"."SCORE")
How many rows are there in ICM_UPSEL_MIN_PRDIFF_0, how many match the "constant" predicates, is there an efficient way of finding them, how many will be left after you apply the subquery test.
Ditto for ICM_PRE, and do the figures look like if you apply the subquery to ICM_PRE (which seems possible)
What's the most precise path for joining the two main tables - and is there a supporting index for that join
Notice that you have a duplicated predicate in your original query - is the query correct ?
Notice that the subquery has turned into a "null aware anti join" - so changing the NOT IN to a NOT EXISTS (suggested by another poster) is not logically the same query - do you have a missing constraint (or two) which might help the optimizer find a better path.
Regards
Jonathan Lewis

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Dear All,
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A INTEGER;
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b number;
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Is there any way can i have it directly??It does not work with static SQL either. Dynamic SQL is no different.
SQL> select 1 x from dual where x = 1 ;
select 1 x from dual where x = 1
ERROR at line 1:
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SQL> BEGIN
2      FOR rec IN (SELECT *
3                  FROM   (SELECT 1,
4                                 2,
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6                          FROM   DUAL)
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11 END;
12 /
PL/SQL procedure successfully completed.
SQL>Message was edited by:
Kamal Kishore

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Hi,
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Hi, everyone.
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Hi,
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Are you sure the query is the same? It looks like the one you posted has a syntax error
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hi,
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regards

Hi,
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Regards,
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Should the column name in the not in clause be indexed?

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