can we create an index only for a given value in a column?

desc TAB_A
-----------------
id1  Number Primary key,
id2  Number,
col1 varchar2(10),
col2 varchar2(10)



select count(*) from TAB_A
--------------------
4587609

select count(*) from TAB_A where id2=10 
------------------
6000

Here is my question


can i create an index only for the cloumn id2 only for the value 10?
Thank you
Mike

Hi, Mike,.

You can have a function-based index.

CREATE INDEX tab_a_id2_10 ON tab_a
(   CASE
        WHEN  id2 IN (10)
        THEN  id2
    END
);

In Oracle 11.2, it might be cleaner to have a virtual column (indexed).

Tags: Database

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