select sClass 班級,count(*) 班級學生總人數,sum(case when sGender=0 then 1 else 0 end) 女生人數,sum(case when sGender=0 then 1 else 0 end)*1.0/count(*)女生所占比例,sum ...
需求:需統計出某個集合內,某個段所占的比例,涉及SELECT查詢語句的嵌套,如有疑問可留言。 如下: 按性別進行年度掛號年齡段分析 男SELECT 年齡段,SUM 人數 數量,cast cast SUM 人數 select count from YXHIS ..VTBMZGHMX WHERE BTH AND CXB 男 . as decimal , as varchar 所占比例 FROM SEL ...
2021-03-02 16:40 0 642 推薦指數:
select sClass 班級,count(*) 班級學生總人數,sum(case when sGender=0 then 1 else 0 end) 女生人數,sum(case when sGender=0 then 1 else 0 end)*1.0/count(*)女生所占比例,sum ...
select sClass 班級,count(*) 班級學生總人數, sum(case when sGender=0 then 1 else 0 end) 女生人數, sum(case when sGender=0 then 1 else 0 end)*1.0/count(*)女生所占比例 ...
輸出結果: numOfTotal numOfMale numOfFemale percentOfMale perscentOfFemale18 14 4 0. ...
select nnd as '年齡段',count(*) as '人數',sex as '性別' from(selectcasewhen age>=1 and age<=10 then '1-10'when age>=11 and age<=20 then '11-20 ...
復雜的sql語句,按部門統計人數: ...
For rebuilding index, here is also a script to figure out the fragmentation and decide whether rebui ...
第一種方法: SELECT user.sex, count(user.sex) as 總數 FROM test.user group by user.sex; `` 第二種方法: 說明: ...
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