noone? :(
Am 02.02.2010 17:08, schrieb Patrick Mueller:
Hi derby users!
In my database I want two columns referencing as FK to the same column
in another table(see below) using the delete connection SET NULL but
it just won't work.
ALTER TABLE HM_DESK ADD CONSTRAINT DESK_OWNER_FK FOREIGN KEY
(IDF_OWNER) REFERENCES HM_USER (ID_USER) ON DELETE SET NULL;
ALTER TABLE HM_DESK ADD CONSTRAINT DESK_LASTEDITEDBY_FK FOREIGN KEY
(IDF_LASTEDITEDBY) REFERENCES HM_USER (ID_USER) ON DELETE SET NULL;
--> results in a error when executing the second statement:
"Error: Foreign Key 'DESK_LASTEDITEDBY_FK' is invalid because 'The
table cannot be defined as a dependent of table APP.HM_USER because of
delete rule restrictions. (The relationship causes the table to be
delete-connected to the indicated table through multiple relationships
and the delete rule of the existing relationship is SET NULL.). '.
SQLState: 42915
ErrorCode: 30000"
if I am using 'ON DELETE CASCADE' it works perfectly fine.. what's
wrong?
Thanks in advance!
Patrick M.
