MySQL Union合并查询数据及表别名、字段别名用法分析

本文实例讲述了MySQL Union合并查询数据及表别名、字段别名用法。分享给大家供大家参考，具体如下： union关键字 SELECT s_id, f_name, f_price FROM fruits WHERE f_price < 9.0 UNION ALL SELECT s_id, f_name, f_price FROM fruits WHERE s_id IN(101,103); 为表取别名 SELECT * from orders AS o WHERE o.o_num = 30001; SELECT c.c_id, o.o_num FROM customers AS c