数据库表设置外键

1> -- 创建测试主表. ID 是主键.
2> CREATE TABLE test_main (
3>   id      INT,
4>   value   VARCHAR(10),
5>   PRIMARY KEY(id)
6> );
7> go


-- 建表时设置外键
1> CREATE TABLE test_sub (
2>   id      INT,
3>   main_id INT,
4>   value   VARCHAR(10),
5>   PRIMARY KEY(id),
6>   FOREIGN KEY (main_id)  REFERENCES  test_main
7> );
8> go