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Foreign key constraints mapping [message #314468] Wed, 16 April 2008 16:27 Go to next message
Messages: 97
Registered: June 2005
Dear All,

Here is one case I like to learn. For example, we have a table called T1 and it has a child table T2. Again T2 table has a child table T3. And again, table T3 has a child table T4.

Not to bore you any more:

T1 is the parent table of T2

T2 is the parent table of T3

T3 is parent table of T4

Now we know only the T1 table name and is there a query to find out all the constraint relationships from T1 all the way to T4.

I could use something like this:

select * from user_constraints
where r_constraint_name in
(select constraint_name from user_constraints
where table_name in ('T1'));

and it would show me the table T2 has Foreign key for T1. but how we see the whole picture of the family tree all the way to T4.


Re: Foreign key constraints mapping [message #314472 is a reply to message #314468] Wed, 16 April 2008 17:10 Go to previous message
Messages: 3186
Registered: April 2005
Location: Heilbronn, Germany
Senior Member
You are looking for Hierarchical Queries.
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