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
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Shirish Khapre
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
