请查询某一科目分数大于85分的所有学生的名单

这是一道面试题

题目照片--



CREATE DATABASE interview;

USE interview;

--学生表字段分别表示：学生ID，学生所属班级ID，学生名称

CREATE TABLE student (

std_id VARCHAR(30) PRIMARY KEY,

cls_id VARCHAR(30),

std_name VARCHAR(30),

CONSTRAINT cls_id_fk1 FOREIGN KEY(cls_id) REFERENCES class(cls_id)

)

--班级表字段分别表示：班级ID，班级名称

CREATE TABLE class (

cls_id VARCHAR(30) PRIMARY KEY,

cls_name VARCHAR(30)

)

--分数表字段分别表示：分数ID，学生ID，课程ID，

CREATE TABLE score (

s_id VARCHAR(30),

std_id VARCHAR(30),

t_id VARCHAR(30),

s_value INT,

CONSTRAINT std_id_fk1 FOREIGN KEY(std_id) REFERENCES student(std_id),

CONSTRAINT t_id_fk1 FOREIGN KEY(t_id) REFERENCES timetable(t_id)

)

--课程表字段分别表示：课程ID，课程名称

CREATE TABLE timetable (

t_id VARCHAR(30) PRIMARY KEY,

t_name VARCHAR(30)

)

DROP TABLE class;

DROP TABLE timetable;

DROP TABLE score;

INSERT INTO class (cls_id,cls_name) VALUES ('cls001','a');

INSERT INTO class (cls_id,cls_name) VALUES ('cls002','b');

INSERT INTO class (cls_id,cls_name) VALUES ('cls003','c');

INSERT INTO class (cls_id,cls_name) VALUES ('cls004','d');

INSERT INTO timetable (t_id,t_name) VALUES ('t001','语文');

INSERT INTO timetable (t_id,t_name) VALUES ('t002','数学');

INSERT INTO timetable (t_id,t_name) VALUES ('t003','英语');

INSERT INTO timetable (t_id,t_name) VALUES ('t004','化学');

INSERT INTO student (std_id,cls_id,std_name) VALUES ('std001','cls001','张三');

INSERT INTO student (std_id,cls_id,std_name) VALUES ('std002','cls001','李四');

INSERT INTO student (std_id,cls_id,std_name) VALUES ('std003','cls002','王五');

INSERT INTO student (std_id,cls_id,std_name) VALUES ('std004','cls003','小刘');

INSERT INTO student (std_id,cls_id,std_name) VALUES ('std005','cls004','大气');

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s001','std001','t001',23);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s002','std001','t001',33);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s003','std001','t002',59);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s004','std002','t003',66);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s005','std002','t004',72);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s006','std003','t001',87);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s007','std003','t002',99);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s008','std004','t003',61);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s009','std005','t004',94);

INSERT INTO score (s_id,std_id,t_id) VALUES ('s010','std005','t004');

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s011','std001','t003',86);

INSERT INTO score (s_id,std_id,t_id,s_value) VALUES ('s012','std002','t003',88);

SELECT * FROM class;

SELECT * FROM timetable;

SELECT * FROM student;

SELECT * FROM score;

----请查询某一科目分数大于85分的所有学生的名单，

----查询列包括 学生姓名，班级名称，大于等于85分的科目数，小于85（包含无成绩的）科目数；

SELECT student.std_name,class.cls_name,

SUM(CASE WHEN score.s_value>=85 THEN 1 ELSE 0 END) AS '大于等于85分的科目数',

SUM(CASE WHEN score.s_value>=85 THEN 0 ELSE 1 END) AS '小于85（包含无成绩的）科目数',timetable.t_name,COUNT(*)

FROM student,class,score,timetable

WHERE score.t_id=timetable.t_id

AND score.std_id=student.std_id

AND student.cls_id=class.cls_id

OR score.s_value=NULL

GROUP BY score.std_id