Hi Shirish, FWIW:
Function-based index? Reverse index? for case II?
Have you considered either of these options to ease the pain of that query?
HTH
Lisa Koivu
Clumsy Ninja-ette (WAaaaaaaaaaaaa!)
Ft. Lauderdale, FL, USA
-----Original Message-----
From: Shirish Khapre [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, June 26, 2001 11:42 AM
To: Multiple recipients of list ORACLE-L
Subject: DUPLICATE VALUE CHECK
Hi all
i have one column in my table (in which daily 100000 rows are added to the
table) which has values like
XYZ_A_LO0000_0000001
XYZ_A_LO0000_0000002
XYZ_A_LO0000_0000003
XYZ_A_LO0000_0000004
XYZ_A_LO0000_0000005
XYZ_A_LO0000_0000006
XYZ_A_LO0000_0000007
XYZ_A_LO0000_0000008
XYZ_A_LO0000_0000009
i want to check duplicate values.. there are 2 cases of duplication
Case I :- i am using the following query
select from my_table where rowid not in(
select max(rowid) from my_table
group by my_column_name );
i am getting the rows which are duplicate ..
CASE II : - i want to check duplication in last 7 characters(which are
actually nos) in my column like
0000001
0000002
0000003....so on....
i am using substr function to get this value and i am checking the values
with remaining rows..
but as the table contains nearly 450000(present rowcount) the query is
taking lot of time...which i can't afford...
the column has index on it.
plz suggest me what to do??
Shirish Khapre, SE Rolta India Ltd.
Off Ph No. (+91) (022) 8326666,8262222,8300568
Ext'n 2730
Minds are like parachutes. They only function when they are open
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Author: Shirish Khapre
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