Question

需要建议查询。一种解决方案是为所有月份创建一个日期表。

我想在count(c3.id)的所有日子里February获得cs.created_at 与group by day(cs.created_at)中一样，缺少某些日期，我如何使用以下条款。

group by day(month(cs.created_at))

像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)这样的东西不起作用..

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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)

Mysql：获得一个月的所有日子

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