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--Column ID of table A is primary key: CREATE TABLE A ( ID int4 not null ); CREATE UNIQUE INDEX AI ON A (ID); --Columns REFB of table B and REFC of C are foreign keys referencing ID of A: CREATE TABLE B ( REFB int4 ); CREATE INDEX BI ON B (REFB); CREATE TABLE C ( REFC int4 ); CREATE INDEX CI ON C (REFC); --Trigger for table A: CREATE TRIGGER AT BEFORE DELETE OR UPDATE ON A FOR EACH ROW EXECUTE PROCEDURE check_foreign_key (2, 'cascade', 'ID', 'B', 'REFB', 'C', 'REFC'); /* 2 - means that check must be performed for foreign keys of 2 tables. cascade - defines that corresponding keys must be deleted. ID - name of primary key column in triggered table (A). You may use as many columns as you need. B - name of (first) table with foreign keys. REFB - name of foreign key column in this table. You may use as many columns as you need, but number of key columns in referenced table (A) must be the same. C - name of second table with foreign keys. REFC - name of foreign key column in this table. */ --Trigger for table B: CREATE TRIGGER BT BEFORE INSERT OR UPDATE ON B FOR EACH ROW EXECUTE PROCEDURE check_primary_key ('REFB', 'A', 'ID'); /* REFB - name of foreign key column in triggered (B) table. You may use as many columns as you need, but number of key columns in referenced table must be the same. A - referenced table name. ID - name of primary key column in referenced table. */ --Trigger for table C: CREATE TRIGGER CT BEFORE INSERT OR UPDATE ON C FOR EACH ROW EXECUTE PROCEDURE check_primary_key ('REFC', 'A', 'ID'); -- Now try INSERT INTO A VALUES (10); INSERT INTO A VALUES (20); INSERT INTO A VALUES (30); INSERT INTO A VALUES (40); INSERT INTO A VALUES (50); INSERT INTO B VALUES (1); -- invalid reference INSERT INTO B VALUES (10); INSERT INTO B VALUES (30); INSERT INTO B VALUES (30); INSERT INTO C VALUES (11); -- invalid reference INSERT INTO C VALUES (20); INSERT INTO C VALUES (20); INSERT INTO C VALUES (30); DELETE FROM A WHERE ID = 10; DELETE FROM A WHERE ID = 20; DELETE FROM A WHERE ID = 30; SELECT * FROM A; SELECT * FROM B; SELECT * FROM C;