需求描述

有兩張表，想要查詢每個班級排名第三的學生。排名按照總成績排（數學+英語）。表結構如圖：

student表：

score表：

mysql version 5.5 or 8.0.

希望大家幫我寫兩個版本的。謝謝大家了

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數據：

student表：

1 name1 class1

2 name2 class1

3 name3 class1

4 name4 class1

5 name5 class2

6 name6 class2

7 name7 class2

8 name8 class2

score表：

1 1 English 100

2 1 Math 95

3 2 English 96

4 2 Math 95

5 3 English 100

6 3 Math 99

7 4 English 98

8 4 Math 97

9 5 English 99

10 5 Math 95

11 6 English 96

12 6 Math 94

13 7 English 92

14 7 Math 100

15 8 English 97

16 8 Math 95

解決方法

-- #1 建表語句及初始化腳本 CREATE TABLE stu (id SMALLINT, name varchar(12), className varchar(12) )CREATE TABLE score (id SMALLINT, stu_id varchar(12), courseName varchar(12), courseScore SMALLINT )INSERT INTO stu VALUES ('1','name1','class1'); INSERT INTO stu VALUES ('2','name2','class1'); INSERT INTO stu VALUES ('3','name3','class1'); INSERT INTO stu VALUES ('4','name4','class1'); INSERT INTO stu VALUES ('5','name5','class2'); INSERT INTO stu VALUES ('6','name6','class2'); INSERT INTO stu VALUES ('7','name7','class2'); INSERT INTO stu VALUES ('8','name8','class2');INSERT INTO score VALUES ('1','1','English','100'); INSERT INTO score VALUES ('2','1','Math','95'); INSERT INTO score VALUES ('3','2','English','96'); INSERT INTO score VALUES ('4','2','Math','95'); INSERT INTO score VALUES ('5','3','English','100'); INSERT INTO score VALUES ('6','3','Math','99'); INSERT INTO score VALUES ('7','4','English','98'); INSERT INTO score VALUES ('8','4','Math','97'); INSERT INTO score VALUES ('9','5','English','99'); INSERT INTO score VALUES ('10','5','Math','95'); INSERT INTO score VALUES ('11','6','English','96'); INSERT INTO score VALUES ('12','6','Math','94'); INSERT INTO score VALUES ('13','7','English','92'); INSERT INTO score VALUES ('14','7','Math','100'); INSERT INTO score VALUES ('15','8','English','97'); INSERT INTO score VALUES ('16','8','Math','95');-- #2 Mysql 8.0 SELECT * FROM (SELECT *,ROW_NUMBER()OVER(PARTITION BY className ORDER BY total DESC) rnFROM(SELECT B.id,B.className,SUM(courseScore) total FROM score AJOIN stu BON B.id = A.stu_idWHERE A.courseName IN('Math','English')GROUP BY B.idORDER BY B.className,total DESC)A )B WHERE rn<=3-- #3 Mysql 5.5 SELECT * FROM (select id,className,total,rank from (select className,heyf_tmp.id,heyf_tmp.total,@rownum := @rownum+1 ,if(@pdept= heyf_tmp.className,@rank:=@rank +1, @rank:= 1) as rank,@pdept:=heyf_tmp.classNamefrom ( SELECT B.id,B.className,SUM(courseScore) total FROM score AJOIN stu BON B.id = A.stu_idWHERE A.courseName IN('Math','English')GROUP BY B.idORDER BY B.className,total DESC) heyf_tmp ,(select @rownum:=0 , @pdept:= null ,@rank:= 0) aorder by className asc ,total desc) result ) A WHERE A.rank<=3 order by className,rank;-- #4 結果 /* id className total rank 3 class1 199 1 1 class1 195 2 4 class1 195 3 5 class2 194 1 7 class2 192 2 8 class2 192 3*/

執行結果

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