添加约束

SQL>alter table customer add constraint cardunique unique(cardId);

删除约束

SQL>alter table customer drop constraint addresscheck;

在删除主键的时候，必须带上cascade选项

SQL>alter table customer primary key cascade;

添加主键

SQL>alter table customer add constraint pkkey primary key(customerId);

查看约束信息

SQL> select constraint_name,table_name,r_owner,r_constraint_name

2  from all_constraints where table_name='goods' and table_name='customer';

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