Hello, Bruno.
You wrote 9 08 2003, 18:08:09:
BWI> On Mon, Aug 04, 2003 at 11:17:56 +0300,
BWI> evl@my-mail.com.ua wrote:
>> Please help.
>>
>> Need a boolean function which returns true if given key in table is
>> referensed from another table(s).
BWI> Use "exists" with a subselect. Something like:
BWI> select exists(select 1 from table where table.key = 'value');
Thanx for advice, but way I know and it can't be used.That's why I've got too many and/or too big tables from which
such key is referenced. I mean (in some simplified way):
table A ( -- main table A id SERIAL, PRIMARY KEY(id));
tableBxx ( -- a lot of tables which got a.id as FOREIGN KEY ... -- too much to check 'em
allwith EXISTS queries a_id int4 REFERENCES a(id), -- without significant perfomance loss ...);
So I need: "silent delete" - i.e. when trying to DELETE row from A I'll not fall out with "$1 referential integrity
violation- key in A still referenced from Bxx", but silently doesn't delete row ('cause run it from function and need
functionto executes farther after delete); "something to check reference" - system (potgresql) is very quickly
realizesthat key is referenced from another table, maybe this information may be accessed through some system
relations,or so?
Thanx for attention.
--
Best regards, eVl
