mysql数据库操作题

概述

续一下之前讲的MySQL数据库sql基础练习第三部分，大家可以跟着做一下。

建表语句CREATE TABLE students(sno VARCHAR(3) NOT NULL, sname VARCHAR(4) NOT NULL,ssex VARCHAR(2) NOT NULL, sbirthday DATETIME,class VARCHAR(5))CREATE TABLE courses(cno VARCHAR(5) NOT NULL, cname VARCHAR(10) NOT NULL, tno VARCHAR(10) NOT NULL)CREATE TABLE scores (sno VARCHAR(3) NOT NULL, cno VARCHAR(5) NOT NULL, degree NUMERIC(10, 1) NOT NULL) CREATE TABLE teachers (tno VARCHAR(3) NOT NULL, tname VARCHAR(4) NOT NULL, tsex VARCHAR(2) NOT NULL, tbirthday DATETIME NOT NULL, prof VARCHAR(6), depart VARCHAR(10) NOT NULL)插入数据ｉｎｓｅｒｔ INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,‘曾华‘ ,‘男‘ ,‘1977-09-01‘,95033);ｉｎｓｅｒｔ INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (105 ,‘匡明‘ ,‘男‘ ,‘1975-10-02‘,95031);ｉｎｓｅｒｔ INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (107 ,‘王丽‘ ,‘女‘ ,‘1976-01-23‘,95033);ｉｎｓｅｒｔ INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,‘李军‘ ,‘男‘ ,‘1976-02-20‘,95033);ｉｎｓｅｒｔ INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (109 ,‘王芳‘ ,‘女‘ ,‘1975-02-10‘,95031);ｉｎｓｅｒｔ INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (103 ,‘陆君‘ ,‘男‘ ,‘1974-06-03‘,95031);ｉｎｓｅｒｔ INTO COURSES(CNO,CNAME,TNO)VALUES (‘3-105‘ ,‘计算机导论‘,825);ｉｎｓｅｒｔ INTO COURSES(CNO,CNAME,TNO)VALUES (‘3-245‘ ,‘操作系统‘ ,804);ｉｎｓｅｒｔ INTO COURSES(CNO,CNAME,TNO)VALUES (‘6-166‘ ,‘数据电路‘ ,856);ｉｎｓｅｒｔ INTO COURSES(CNO,CNAME,TNO)VALUES (‘9-888‘ ,‘高等数学‘ ,100);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (103,‘3-245‘,86);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (105,‘3-245‘,75);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (109,‘3-245‘,68);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (103,‘3-105‘,92);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (105,‘3-105‘,88);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (109,‘3-105‘,76);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (101,‘3-105‘,64);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (107,‘3-105‘,91);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (108,‘3-105‘,78);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (101,‘6-166‘,85);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (107,‘6-106‘,79);ｉｎｓｅｒｔ INTO SCORES(SNO,CNO,DEGREE)VALUES (108,‘6-166‘,81);ｉｎｓｅｒｔ INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (804,‘李诚‘,‘男‘,‘1958-12-02‘,‘副教授‘,‘计算机系‘);ｉｎｓｅｒｔ INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (856,‘张旭‘,‘男‘,‘1969-03-12‘,‘讲师‘,‘电子工程系‘);ｉｎｓｅｒｔ INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (825,‘王萍‘,‘女‘,‘1972-05-05‘,‘助教‘,‘计算机系‘);ｉｎｓｅｒｔ INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (831,‘刘冰‘,‘女‘,‘1977-08-14‘,‘助教‘,‘电子工程系‘);题目

1、查询所有教师和同学的name、sex和birthday.

2、查询所有“女”教师和“女”同学的name、sex和birthday.

3、查询成绩比该课程平均成绩低的同学的成绩表。

4、查询所有任课教师的Tname和Depart.

5 查询所有未讲课的教师的Tname和Depart.

6、查询至少有2名男生的班号。

7、查询Student表中不姓“王”的同学记录。

8、查询Student表中每个学生的姓名和年龄。

9、查询Student表中最大和最小的Sbirthday日期值。

10、以班号和年龄从大到小的顺序查询Student表中的全部记录。

11、查询“男”教师及其所上的课程。

12、查询最高分同学的Sno、Cno和Degree列。

13、查询和“李军”同性别的所有同学的Sname.

14、查询和“李军”同性别并同班的同学Sname.

15、查询所有选修“计算机导论”课程的“男”同学的成绩表

答案

1.查询所有教师和同学的name、sex和birthday.

ｓｅｌｅｃｔ Sname,Ssex,Sbirthday FROM Studentsｕｎｉｏｎｓｅｌｅｃｔ Tname,Tsex,Tbirthday FROM Teachers;

2.查询所有“女”教师和“女”同学的name、sex和birthday.

ｓｅｌｅｃｔ Sname,Ssex,Sbirthday FROM Students WHERE Ssex=‘女‘ｕｎｉｏｎｓｅｌｅｃｔ Tname,Tsex,Tbirthday FROM Teachers WHERE Tsex=‘女‘;

3.查询成绩比该课程平均成绩低的同学的成绩表。

ｓｅｌｅｃｔ s1.* FROM Scores AS s1 INNER JOIN ( ｓｅｌｅｃｔ Cno,AVG(Degree) AS aDegree FROM Scores GROUP BY Cno) s2 ON(s1.Cno=s2.Cno AND s1.Degree=2;

7.查询Student表中不姓“王”的同学记录。

ｓｅｌｅｃｔ * FROM Students WHERE Sname NOT LIKE ‘王%‘;

8.查询Student表中每个学生的姓名和年龄。

ｓｅｌｅｃｔ Sname,YEAR(NOW())-YEAR(Sbirthday) AS Sage FROM Students;

9.查询Student表中最大和最小的Sbirthday日期值。

ｓｅｌｅｃｔ MIN(Sbirthday),MAX(Sbirthday) FROM Students;

10.以班号和年龄从大到小的顺序查询Student表中的全部记录。

ｓｅｌｅｃｔ * FROM Students ORDER BY Class DESC,Sbirthday ASC;

11.查询“男”教师及其所上的课程。

ｓｅｌｅｃｔ Teachers.Tname,Courses.Cname FROM Teachers INNER JOIN Courses ON(Teachers.Tno=Courses.Tno) WHERE Teachers.Tsex=‘男‘;

12.查询最高分同学的Sno、Cno和Degree列。

ｓｅｌｅｃｔ * FROM Scores GROUP BY Cno HAVING Degree=Max(Degree);

13.查询和“李军”同性别的所有同学的Sname.

ｓｅｌｅｃｔ s1.Sname FROM Students AS s1 INNER JOIN Students AS s2 ON(s1.Ssex=s2.Ssex) WHERE s2.Sname=‘李军‘;

14.查询和“李军”同性别并同班的同学Sname.

ｓｅｌｅｃｔ s1.Sname FROM Students AS s1 INNER JOIN Students AS s2 ON(s1.Ssex=s2.Ssex AND s1.Class=s2.Class) WHERE s2.Sname=‘李军‘;

15.查询所有选修“计算机导论”课程的“男”同学的成绩表

ｓｅｌｅｃｔ * FROM Scores WHERE Sno IN ( ｓｅｌｅｃｔ Sno FROM Students WHERE Ssex=‘男‘) AND Cno IN ( ｓｅｌｅｃｔ Cno FROM Courses WHERE Cname=‘计算机导论‘);

到这里我们的sql练习部分就讲完了，建议大家有空可以自己在MySQL数据库上测试一下，三个部分做下来也就一个小时，强化下基础还是可以的，侧重去考虑如何写才能更高效。

后面小编会分享更多DBA方面内容，感兴趣的朋友走一波关注哩~