mysql(4,视图）

直接上例子

1. 查询 购买‘TNT2‘商品的  买家名字，合同

select cust_name,cust_contact FROM
customers c inner join orders o on c.cust_id=o.cust_id
inner join orderitems oi on oi.order_num=o.order_num
and prod_id=‘TNT2‘

2 .创建 视图  productcustomers(没有

 prod_id=‘TNT2‘限制条件

)

create view productcustomers as
select cust_name,cust_contact,prod_id FROM
customers c inner join orders o on c.cust_id=o.cust_id
inner join orderitems oi on oi.order_num=o.order_num

3. 查询视图（使用 where prod_id=‘TNT2‘）

4.show create view xxx

5.drop view xxx 删除视图