RE: DUPLICATE VALUE CHECK

From: Mercadante, Thomas F <NDATFM_at_labor.state.ny.us>
Date: Tue, 26 Jun 2001 11:46:30 -0700
Message-ID: <F001.00338A4D.20010626110054@fatcity.com>

Shirish,

If the last 7 digits of this column has to be unique throughout the table, why not, upon insert, move this value to another column in the table and place a unique key on that column? This will prevent the record from being inserted.

CREATE OR REPLACE TRIGGER TEST_TRIGGER
BEFORE INSERT
ON TEST_TABLE
FOR EACH ROW begin
:new.number_column := to_number(substr(:new.full_column,-7,7)); end;
/

I have to ask the question - if a "part" of this data field is so important, shouldn't it be in a separate column anyway? It seems to me that the design of this data column is incorrect.

I think I would break it up into several pieces like:

existing value XYZ_A_LO0000_0000001

col_prefix     =  XYZ
col_header     =  A
col_log        =  LO0000
col_nbr        =  0000001

Is this the primary key for the record? You could still have the PK be the above 4 columns.

hope this helps

Tom Mercadante
Oracle Certified Professional

-----Original Message-----
Sent: Tuesday, June 26, 2001 1:11 PM
To: Multiple recipients of list ORACLE-L

i am getting duplicate records if the whole (say XYZ_A_LO0000_0000001) value is repeated without much probs..
but my prob is checking duplication of the last 7 digits..

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
INET: shirish_at_rolta.com

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Author: Mercadante, Thomas F
INET: NDATFM_at_labor.state.ny.us

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