令狐冲之12

摘要： 1.建表create table CUSTOMERS( CID NUMBER not null, CNAME NVARCHAR2(50) not null)create table ORDERS( OID NUMBER not null, ONAME VARCHAR2(50) not null, CID NUMBER)2.添加数据select * from customers;CID CNAME---------- --------------- 1 张三2 李四3 王五select * from orders; OID ONAMECID---------- ----------------- 阅读全文