MySQL数据库多表之间的查询

问题描述

问题解答

分两种情况选出符合要求的company_id并union

把这些company_id的earning求和（2013-2014）

连接上company_name

好像搞的比较复杂。

with cid(id) as ( select company_id from tableB where year = 2014 and earning > 20 union select company_id from tableB where year in (2013, 2014) group by company_id having sum(earning) > 50), cid_earning(id, earning) as ( select company_id, sum(earning) from tableB where company_id in (select id from cid) and year in (2013, 2014) group by company_id)select a.company_name, c.earningfrom cid_earning c left join tableA a using(id)思路二

如果把2013和2014年的earning作为表的两个field，SQL的逻辑会清晰很多：

withe3(id, earning) as ( select company_id, earning from tableB where year = 2013), e4(id, earning) as ( select company_id, earning from tableB where year = 2014)select a.company_name, e3.earning + e4.earning as earningfrom e3 inner join e4 using(id)left join tableA a using(id)where e4.earning > 20 or e3.earning + e4.earning > 50回答2：

好复杂哦，同问，这样的sql怎么写，我在想是不是可以写个存储过程，毕竟存储过程处理这样复杂的逻辑容易一点