Not exist vs not in vs. =

Hi all

Oracle Database 10 g Enterprise Edition Release 10.2.0.4.0 - 64 bit

I want to know what is the best according to the performance wise.

I am running after query
select count(*) from d_cmpny_load a, d_cmpny b
where a.duns_id != b.duns_id

both tables has 20 Million records

index was created on duns_id for both the tables
and it took 45 minutes and I see no output... I want to know performance wise that is best to examine


Thank you...

Hello
If you want to know the number of missing documents, you can try this query. You should see scan limited index full joined with hash join in the plan of the explain command.

SELECT /*+ use_hash(t1 t2)*/  COUNT(t1.duns_id)
FROM d_cmpny_load t1,
     d_cmpny t2
WHERE t1.duns_id = t2.duns_id (+)
  AND t2.duns_id IS NULL;

Tags: Database

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