按月份统计某一个机构的某列出现的次数
设计一张表 a 结构是 user_id 用户id user_name 用户姓名 web_id 用户所属网站id createtime 用户创建时间 需求：统计各个网站id每个月新增的用户数量 select count(*),to_char(a.createtime,yyyy-mm),a.web_id from 表 a where a.createtime is not null gr
设计一张表 a 结构是
user_id 用户id
user_name 用户姓名
web_id 用户所属网站id
createtime 用户创建时间
需求：统计各个网站id每个月新增的用户数量
select count(*),to_char(a.createtime,'yyyy-mm'),a.web_id
from 表 a where a.createtime is not null
group by to_char(a.createtime,'yyyy-mm'), /*按创建时间来统计*/
a.web_id /*按网站来统计*/
order by a.web_id ,to_char(a.createtime,'yyyy-mm') desc ;
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