Question

I have an SQL statement where I would like to get data of 1200 ep_codes by making use of IN clause. When I include more than 1000 ep_codes inside IN clause, Oracle says I’m not allowed to do that. To overcome this, I tried to change the SQL code as follows:

SELECT period, ...
FROM   my_view
WHERE  period = '200912'
       ...
       AND ep_codes IN (...1000 ep_codes...)
       OR  ep_codes IN (...200 ep_codes...)

The code was executed succesfully but the results are strange (calculation results are fetched for all periods, not just for 200912, which is not what I want). Is it appropriate to do that using OR between IN clauses or should I execute two separate codes as one with 1000 and the other with 200 ep_codes?

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Pascal Martin’s solution worked perfectly. Thanks all who contributed with valuable suggestions.

Answer 1

Not sure that using so many values in a IN() is that good, actually — especially for performances.

When you say “the results are strange“, maybe this is because a problem with parenthesis ? What if you try this, instead of what you proposed :

SELECT ...
FROM ...
WHERE ...
      AND (
          ep_codes IN (...1000 ep_codes...)
          OR  ep_codes IN (...200 ep_codes...)
      )

Does it make the results less strange ?