mysql group中能否使用兩個count呢

問題描述

問題解答

其實最好寫明你的表結構，以下答案基于你提供的有限信息：

select district as 行政區，count(1) as 小區數 -- 我默認你每個小區時一條記錄，且無重復, sum(if(idNB = 1 ,1 ,0)) as 高檔小區數 -- 假設高檔小區的idNB標記為1from table_name group by district其實 sum(if(idNB = 1 ,1 ,0)) 也可以替換成count(idNB = 1 or null)回答2：

mysql不支持分析函數:

select t1.district, (select count(t2.xiaoqu) from table t2 where t2.district=t1.district) count_xiaoqu, (select count(t2.idNB) from table t2 where t2.district=t1.district) count_idNBfrom table t1

分析函數的寫法:

select district, count(xiaoqu) over (district) count_xiaoqu, count(idNB) over (district) count_idNBfrom table回答3：

我這邊說下我的思路吧，使用MySQL將區內的高端小區和非高端小區統計出來

select district,idNB,count(*) from xx GROUP BY district,idNB

然后區內小區的總數再由服務端這邊自己處理計算。