What I have understood is that against each ID in table A there are several
Sub-Names in table B.
Your data in table A is:
1,
and in table B is
1*,
1*,
1*,
(* has an ID 1 which is there in table B)
You want that the any of above 3 record should not be possible to insert in
table B
In that case you need to define your Primary Key on ID and Sub-Name
ALTER TABLE B ADD PRIMARY KEY (ID, SubName);
HTH!
Aleem
-Original Message-
Sent: Monday, September 02, 2002 1:13 PM
To: Multiple recipients of list ORACLE-L
Subject:Re: Unique value
sultan wrote:
Hi friends,
I have a tables A and B
DESC A
IDNUMBER
NAME VARHAR2(10)
DESC B
---
ID NUMBER
SUBNAMEVARCHAR2(20);
In the above table B.ID is the foreign key to A.ID.
How can I create unique value for B.SUBNAME based on A.NAME.
Means , A.NAME has value ' and
B.SUBNAME has values '', '';
when I insert value again in B.SUBNAME as '' it
should not agree for the combination value of A.NAME(''),
but '' can agree when I enter value for A.NAME
other than ''
Please give some ideas,
Thanks in advance
syed.
Unique index on (id, subname), that's what concatenated indices are for.
--
Regards,
Stephane Faroult
Oriole Software
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Stephane Faroult
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).
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Abdul Aleem
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).
