| DROP TABLE D; |
| DROP TABLE C; |
| DROP TABLE B; |
| DROP TABLE A; |
| |
| |
| CREATE TABLE A |
| ( |
| id INT PRIMARY KEY NOT NULL, |
| name VARCHAR(32) |
| ); |
| |
| CREATE TABLE B |
| ( |
| id INT PRIMARY KEY NOT NULL, |
| name VARCHAR(32) , |
| aId INT , |
| FOREIGN KEY (aId) REFERENCES A (id) |
| ); |
| |
| CREATE TABLE C |
| ( |
| id INT PRIMARY KEY NOT NULL, |
| name VARCHAR(32) , |
| aId INT , |
| bId INT , |
| FOREIGN KEY (aId) REFERENCES A (id), |
| FOREIGN KEY (bId) REFERENCES B (id) |
| ); |
| |
| CREATE TABLE D |
| ( |
| id INT PRIMARY KEY NOT NULL, |
| name VARCHAR(32) , |
| aId INT , |
| bId INT , |
| cId INT , |
| FOREIGN KEY (aId) REFERENCES A (id), |
| FOREIGN KEY (bId) REFERENCES B (id), |
| FOREIGN KEY (cId) REFERENCES C (id) |
| ); |