At 19:21 +0100 3/16/03, Tor R. Skoglund (NextG) wrote:Hi List, regarding the foreign key definitions:
[CONSTRAINT symbol] FOREIGN KEY (index_col_name, ...) REFERENCES table_name (index_col_name, ...) [ON DELETE {CASCADE | SET NULL | NO ACTION | RESTRICT}] [ON UPDATE {CASCADE | SET NULL | NO ACTION | RESTRICT}]
Is there a default action for ON DELETE and ON UPDATE if no action is specified in the database definition?
The NO ACTION action seems to cover this. :-)
I presume RESTRICT makes it impossible to delete a record from the parent table if there are any references from a child record to the parent for that key?
It's unimplemented.
Heikki's clarified that RESTRICT is the default, which means it must be implemented.
Obviously I don't know anything. Don't listen to me.
-- Paul DuBois http://www.kitebird.com/ sql, query
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