如何在一個(gè)表中創(chuàng)建兩個(gè)外鍵,
? CREATE TABLE SC(
? ? ->? Sno int NOT NULL PRIMARY KEY AUTO_INCREMENT,
? ? ->? Cno int NOT NULL,
? ? ->? Grade int NOT NULL,
? ? ->? SSno int NOT NULL,
? ? -> CCno int NOT NULL,
? ? ->? FOREIGN KEY (SSno) REFERENCES Student (Sno),
? ? ->? FOREIGN KEY (CCno) REFERENCES Course (CCno)
? ? -> );
2019-02-26
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