笔记:Sql数据统计

数据结构:



统计回复贴子数量:

select its.Id,its.UserId,its.Title,its.Content,its.AddTime,t.RecordCount from (select ParentId,Count(ParentId) RecordCount from ReplayStickers group by ParentId) as t left join InitiatedStickers its on t.ParentId=its.Id  order by RecordCount desc

显示结果: