mysql之group by進行分組統計

格式：

select 字段1，字段2

from 表名

where 條件

group by 字段

樣例一：

1.須要每一個市的對應數據

-- 計算 審批完成時間和提交審批時間天數（總時間差） 總數據量 行政區劃

select sum(TIMESTAMPDIFF(day,jdjsprq,jspwcrq)) as zsj,count(1) as zsl,substr(JXZJGBH,1,4) xzqh
from sp_jl b
where b.jzt=1 and jdjsprq like '2019%' and jspwcrq like '2019%'
group by substr(JXZJGBH,1,4)

2.select d.xjgmc,round(zsj/zsl,2) as spsx from (select sum(TIMESTAMPDIFF(day,jdjsprq,jspwcrq)) as zsj,count(1) as zsl,substr(JXZJGBH,1,4) xzqhfrom sp_jl bwhere b.jzt=1 and jdjsprq like '2019%' and jspwcrq like '2019%'group by substr(JXZJGBH,1,4)) c,mz_xzjg dwhere c.xzqh=d.node_id