mysql中union,union all 与order by 的常见用法

注意点：

多个复合查询使用一个orderby时，注意用AS后的属性名才行！

例如：

SELECT user_name AS userName,sco_re AS score FROM t1 WHERE user_name LIKE '王%'
UNION
SELECT user_name AS userName,sco_re AS score FROM t1 WHERE user_name LIKE '%m%' ORDER BY score ASC

具体使用见：https://www.cnblogs.com/pcheng/p/5939646.html