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ALTER TABLE user ADD CONSTRAINT FK_Name FOREIGN KEY (bts_id) REFERENCES student(ID);

¸øuser±íµÄbts_id×Ö¶ÎÔö¼ÓÃû×Ö½ÐFk_NameµÄÍâ¼ü£¬Íâ¼üÊÇstudent±íÀïµÄId;