详解mysql函数拼接查询concat函数的使用方法

//查询表managefee_managefee的年year 和 month ,用concat函数拼成year-month。例如将2017和1 拼成2017-01。.

select CONCAT(a.year,'-',if(a.month<=9,CONCAT('0',a.month),a.month))as date,a.* from managefee_managefee as a;

//查询managefee_managefee中时间段为2017-01到2017-07的数据

select * from

(

select CONCAT(a.year,'-',if(a.month<=9,CONCAT('0',a.month),a.month))as date,a.* from managefee_managefee as a

) b

where b.date between '2017-01' and '2017-07';