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Looking for some help with cascading updates...

From: "Mark True" <darfoo(at)gmail(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: Looking for some help with cascading updates...
Date: 2006-04-18 18:19:20
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-sql
Here is the question:

I have a situation where I need to create triggers to cascade an insert
operation to many tables to maintain foreign key constraints.

So at a high level

INSERT INTO myTable (Name, Address, Zip) VALUES ('Mark', '3 Dingle St.',

myTable has a relation to two other tables, which contain Zip and Address.
Before I insert into  myTable I want to:

Check if '3 Dingle St.' exists in table Address, if not insert it
Check if '01832' exists in table Zip and if not insert it

I want to generalize this so that for any insert into myTable, I guarantee
that if Zip and Address are not populated they will be.  My insert into
myTable always contains full information required for doing the inserts into
the other related tables.




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