alter table stu add foreign key(cno) references user(id);
Failed to add the foreign key constraint. Missing index for constraint 'stu_ibfk_1' in the referenced table 'user'
解決方案：
作為外鍵，user表中的id必須是唯一值,因此得添加約束unique,或者primary key;
Failed to add the foreign key constraint. Missing index for constraint 'stu_ibfk_1' in the reference
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