mysql如何按年和月统计

select DATE_FORMAT(来电时间,'%Y-%m') as 月, 问题类别 , count(1) as 数量 from

( select 来电时间, 问题类别 from mytable where 问题类别 = '农村用水投诉' ) tmptable

group by DATE_FORMAT(来电时间,'%Y-%m') ,问题类别 ORDER BY 月 ASC

select

table.year,

table.month,

table.day

from

(SELECT

year(time) year,

month(time) month,

day(time) day

FROM

table) table

group by table.year,table.month,table.day

order BY table.year,table.month,table.day desc

望采纳,有疑问或是有更好写法,请多交流

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