index ??

From: AK <oramagic_at_hotmail.com>
Date: Mon, 31 Mar 2003 09:08:38 -0800
Message-ID: <F001.00576585.20030331090838@fatcity.com>

I have a table X with unix index on column A ,B and non unique index on A,C,D . The query give below doesn't use any index .

I thought its due to function nvl being used here , so made a change in query to replace

B = NVL(:b2,B) with (B=:b2 or :b2 is null ) , but this one also not using index . Why if I put an or condition it doesn't use index while if I put and condition it will used ?

IS there any way I can change query or index so that it starts using index ( in a better way )

Thanks,

-ak

SELECT z

FROM X

WHERE A = :b1 AND

B = NVL(:b2,B) AND

C= nvl(:b3,C) And

D=nvl(:b4,D)

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Author: AK
  INET: oramagic_at_hotmail.com

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