Mysql:获取一个月中的所有天数

Question

需要查询建议。一种解决方案是为所有月份创建一个天表。

我正在尝试获取 二月 月份所有天数的 count(c3.id)。
正如在 cs.created_at 中一样，缺少一些日期，我如何使用下面的子句。

group by day(cs.created_at)

诸如按天分组(月(cs.created_at))之类的东西不起作用..

 select count(case when cs.id IN(select max(id) from complaint3_status
                                  where complaint_id=c3.id  and status_type=10)
                        and cs.status_value=11 then c3.id end
             ) as resolved_complaints 
 from  complaint3 c3, complaint3_status cs, 
       company c, complaint3_details cd, user3 u3 
 where c3.id=cs.complaint_id 
   and cd.complaint_id=c3.id 
   and u3.id=c3.user_id 
   and c.id=c3.company_id 
   and c3.company_id=852 
   and month(cs.created_at)=02 
   and year(cs.created_at)=2014 
 group by day(cs.created_at)

Answer 1

请在 select 语句中提供日期 (cs.created_at)。

 select day(cs.created_at),count(case when cs.id IN(select max(id) from complaint3_status where complaint_id=c3.id  and status_type=10) and
  cs.status_value=11   then c3.id end) as resolved_complaints 
  from  complaint3 c3 , complaint3_status cs, 
  company c,complaint3_details cd,user3 u3 where c3.id=cs.complaint_id and cd.complaint_id=c3.id and
   u3.id=c3.user_id and c.id=c3.company_id and c3.company_id=852 and month(cs.created_at)=02 and year(cs.created_at)=2014 group by day(cs.created_at)