test for the null value to IN request (null, 'a ', ' b', 'c')

Hello

Oracle 10.2.0.4

I think the following query is incorrect, in my opinion. (there is an index on the collar, but NULL values are ignored?

SELECT COUNT (*) < table > where col in (null, 'a ', ' b', 'c')

It works (no errors) and forth fast enough.

However, I think the correct query would

SELECT COUNT (*) < table > where IS NULL or neck neck ('a', 'b', 'c')

It takes a lot of time. As I see it, he performs a table scan for part of the value NULL and use the index for the rest, as the index cannot be used for NULL values.

I would appreicate an explanation on this matter, particularly why Oracle accepts the first query "where col in (null, 'a ', ' b', 'c')" without any problem.

Thank you

A null value is not equal to what whatsoever, not even another null value. This is consistent with the definition of the ANSI. For your first request is not what you think it does, even if it is not syntactically incorrect.

The second query is correct. If you want to use an index, you must create a bitmap index (which requires Enterprise Edition licenses), because they do not include the values NULL, unlike B * tree index.

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