From: Jure Kodzoman <jure@plsavez.hr>
To: pgsql-sql@postgresql.org
Subject: constrains problem...
Date: Wed, 07 Dec 2005 13:38:04 +0100
Message-ID: <1133959084.5964.6.camel@localhost.localdomain> (raw)
Hy list, i would like to ask you for help.
I have 3 tables.
table1 has primary key 't1code' and table_rel is 'many to many'
relation
for table2.
table2 primary key is 't2code'
table_rel has two fields: 't1code' and 't2code', where both of them
together make a primary key for the relation table. This is done so no
double values exist.
What i would like to do is create a trigger or a constraint which would
on delete of an entry from table1 also deleted all entries containing
code from
table1 in table_rel. When i try to put a constraint via PgAdmin3 it says
it can't do
it because 't1code' is not primary key or unique.
I understand the error, but what i would like to know is how to delete
all fields from table_rel containing the 'table1' vaule being equal to
'code' being deleted from table1.
Thanks a lot for your anwser!
Yure
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To: pgsql-sql@postgresql.org
Cc: jure@plsavez.hr
Subject: Re: constrains problem...
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