分析
关键词:union
用法:
- union--连接表,对行操作。
- union--将两个表做行拼接,同时自动删除重复的行。
- union all---将两个表做行拼接,保留重复的行
代码
select prod_name from Products
union
select cust_name as prod_name from Customers
order by prod_name

分析
关键词:union
用法:
代码
select prod_name from Products
union
select cust_name as prod_name from Customers
order by prod_name