---------- Forwarded message ---------- From: Ramesh T <rameshparnandit...@gmail.com> Date: Tue, Jul 22, 2014 at 7:50 PM Subject: Re: [GENERAL] Need r_constraint_name To: Adrian Klaver <adrian.kla...@aklaver.com>
Just i'm retriving the constraint_name when i enter child_table_name for inner query and that constraint name is checking parent_table on outer statement that constraint_name is equal then display the constraint name ..?but outer select is r_constraint_name i think in postgres r_constraint_name is also include in the pg_constraints details not a seperate column in postgres for that ,if parent table have consraint_name same as the child table return from inner query that constraint_name displayed out.. my assumption..is it corect? from last query.. thanks in advance.. ramesh On Tue, Jul 22, 2014 at 7:18 PM, Adrian Klaver <adrian.kla...@aklaver.com> wrote: > On 07/22/2014 03:12 AM, Ramesh T wrote: > >> thank u , >> >> SELECT constraint_name >> FROM information_schema.table_constraints AS tc >> WHERE tc.table_name = p_table_name >> AND constraint_name IN (SELECT constraint_name >> FROM >> information_schema.table_constraints AS tc >> WHERE tc.table_name = >> p_ref_table_name >> AND tc.constraint_type = >> 'PRIMARY KEY'); >> >> is this correct process same as above .. >> >> but i want check "r_constraint_name" instead of "constraint_name" in >> outer statement in above code.. >> > > I am not sure you are going to find that column. I am not an Oracle user > but I did find this: > > http://docs.oracle.com/html/B13531_01/ap_d.htm > > R_CONSTRAINT_NAME is the name of the unique constraint definition for the > referenced table. > > So it would seem r_constraint_name is an column name in an Oracle system > view. I know of no such name in the Postgres system catalog. I am sure the > same information is available, you are just going to have to be specific > about what you are looking for. From the above that would seem to be the > name of the unique key that a foreign key references. > > Is that correct? > > If so the query you show above will not work as a UNIQUE key does not > necessarily have to be the PRIMARY KEY. > > > >> please let me know.. >> >> thanks in advance, >> ramesh >> >> > -- > Adrian Klaver > adrian.kla...@aklaver.com >
