I got the following tables :
CREATE TABLE A (
id_a INT AUTO_INCREMENT PRIMARY KEY,
CREATE TABLE B(
id_b INT AUTO_INCREMENT PRIMARY KEY,
CREATE TABLE C(
id_c INT AUTO_INCREMENT PRIMARY KEY,
cab VARCHAR(40) UNIQUE);
CREATE TABLE D(
FOREIGN KEY(id_as) REFERENCES A(id_a),
FOREIGN KEY(id_bs) REFERENCES…
insert foreign keys with trigger
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