數(shù)據(jù)庫表添加外鍵約束 建完表后怎么給列加外鍵約束？
建完表后怎么給列加外鍵約束？Alter table foreign key table add constraint fk [delete on foreign key]可用于創(chuàng)建外鍵（--delet
建完表后怎么給列加外鍵約束？
Alter table foreign key table add constraint fk [delete on foreign key]可用于創(chuàng)建外鍵（--delete on）級聯(lián)表