[转]T-SQL_面试题

2015-05-19

1 创建表插入数据

Student(S#,Sname,Sage,Ssex) 学生表
Course(C#,Cname,T#) 课程表
SC(S#,C#,score) 成绩表
Teacher(T#,Tname) 教师表

1.1 Student

 1 Create table Student
 2 (
 3 S# number(4),
 4 Sname varchar2(9) not null,
 5 Ssex varchar2(3),
 6 Sage date,
 7 constraint Student_S#_Pk primary key(S#)
 8 );
 9 
10 insert into Student values(1001,'李志国','男',to_date('26-9-1985','dd-mm-yyyy'));
11 insert into Student values(1002,'李甜甜','女',to_date('6-2-1987','dd-mm-yyyy'));
12 insert into Student values(1003,'张小燕','女',to_date('18-11-1984','dd-mm-yyyy'));
13 insert into Student values(1004,'王菲','男',to_date('3-6-1985','dd-mm-yyyy'));
14 insert into Student values(1005,'杜宇','女',to_date('25-4-1986','dd-mm-yyyy'));
15 insert into Student values(1006,'彭大生','男',to_date('28-12-1988','dd-mm-yyyy'));
16 insert into Student values(1007,'王亮','男',to_date('1-8-1983','dd-mm-yyyy'));
17 insert into Student values(1008,'赵婷婷','女',to_date('2-2-1984','dd-mm-yyyy'));

View Code

1.2 Course

Create table Course
(
C# number(3),
Cname varchar2(12) not null,
T# number(4),
constraint Course_C#_Pk primary key(C#),
constraint Course_T#_Fk foreign key (T#) references Teacher(T#)
);

insert into Course values(001,'企业管理',2003);
insert into Course values(002,'马克思',2001);
insert into Course values(003,'OO'||'&'||'UML',2002);
insert into Course values(004,'数据库',2004);
insert into Course values(005,'英语',2005);
insert into Course values(006,'大学语文',2005);
insert into Course values(007,'现代企业',2003);

View Code

1.3 SC

Create table SC
(
S# number(4),
C# number(4),
score number(3),
constraint SC__S#_C#_Pk primary key(S#,C#),
constraint Sc_S#_Fk foreign key (S#) references Student(S#),
constraint Sc_C#_Fk foreign key (C#) references Course(C#)
);

insert into SC values(1001,1,87);
insert into SC values(1001,3,66);
insert into SC values(1001,2,77);
insert into SC values(1001,5,45);
insert into SC values(1001,7,67);
insert into SC values(1002,4,26);
insert into SC values(1002,1,86);
insert into SC values(1003,3,67);
insert into SC values(1003,2,97);
insert into SC values(1003,5,67);
insert into SC values(1004,5,78);
insert into SC values(1004,3,67);
insert into SC values(1004,4,49);
insert into SC values(1005,4,76);
insert into SC values(1005,2,84);
insert into SC values(1005,3,35);
insert into SC values(1006,3,54);
insert into SC values(1006,2,76);
insert into SC values(1006,1,56);
insert into SC values(1007,1,56);
insert into SC values(1007,7,88);
insert into SC values(1007,2,89);
insert into SC values(1007,3,57);
insert into SC values(1007,4,99);
insert into SC values(1007,5,85);
insert into SC values(1008,1,76);
insert into SC values(1008,2,44);
insert into SC values(1008,4,87);
insert into SC values(1008,5,33);
insert into SC values(1002,6,65);
insert into SC values(1002,7,90);
insert into SC values(1006,6,67);

View Code

1.4 Teacher

Create table Teacher
(
T# number(4),
Tname varchar2(9) not null,
constraint Teacher_T#_Pk primary key(T#)
);

insert into Teacher values(2001,'李华');
insert into Teacher values(2002,'王力宏');
insert into Teacher values(2003,'叶平');
insert into Teacher values(2004,'王倩倩');
insert into Teacher values(2005,'李莉莉');

View Code

mysql

DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
  `SId` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `Sname` varchar(255) NOT NULL,
  `Ssex` varchar(255) DEFAULT NULL,
  `Sage` date DEFAULT NULL COMMENT 'CURRENT_TIMESTAMP',
  PRIMARY KEY (`SId`)
) ENGINE=InnoDB AUTO_INCREMENT=1009 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES ('1001', '李志国', '男', '1985-09-26');
INSERT INTO `student` VALUES ('1002', '李甜甜', '女', '1987-02-06');
INSERT INTO `student` VALUES ('1003', '张小燕', '女', '1984-11-18');
INSERT INTO `student` VALUES ('1004', '王菲', '男', '1986-06-03');
INSERT INTO `student` VALUES ('1005', '杜宇', '女', '1986-04-25');
INSERT INTO `student` VALUES ('1006', '彭大生', '男', '1988-08-28');
INSERT INTO `student` VALUES ('1007', '王亮', '男', '1983-08-01');
INSERT INTO `student` VALUES ('1008', '赵婷婷', '女', '1984-02-02');

DROP TABLE IF EXISTS `course`;
CREATE TABLE `course` (
  `CId` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `TId` int(11) DEFAULT NULL,
  `Cname` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`CId`)
) ENGINE=InnoDB AUTO_INCREMENT=1008 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of course
-- ----------------------------
INSERT INTO `course` VALUES ('1001', '2003', '企业管理');
INSERT INTO `course` VALUES ('1002', '2001', '马克思');
INSERT INTO `course` VALUES ('1003', '2002', 'OO&UML');
INSERT INTO `course` VALUES ('1004', '2004', '数据库');
INSERT INTO `course` VALUES ('1005', '2005', '英语');
INSERT INTO `course` VALUES ('1006', '2005', '大学语文');
INSERT INTO `course` VALUES ('1007', '2003', '现代企业');

DROP TABLE IF EXISTS `sc`;
CREATE TABLE `sc` (
  `SCId` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `SId` int(11) DEFAULT NULL,
  `CId` int(11) DEFAULT NULL,
  `score` int(255) DEFAULT NULL,
  PRIMARY KEY (`SCId`)
) ENGINE=InnoDB AUTO_INCREMENT=33 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of sc
-- ----------------------------
INSERT INTO `sc` VALUES ('1', '1001', '1', '87');
INSERT INTO `sc` VALUES ('2', '1001', '3', '66');
INSERT INTO `sc` VALUES ('3', '1001', '2', '77');
INSERT INTO `sc` VALUES ('4', '1001', '5', '45');
INSERT INTO `sc` VALUES ('5', '1001', '7', '67');
INSERT INTO `sc` VALUES ('6', '1002', '4', '26');
INSERT INTO `sc` VALUES ('7', '1002', '1', '86');
INSERT INTO `sc` VALUES ('8', '1003', '3', '67');
INSERT INTO `sc` VALUES ('9', '1003', '2', '97');
INSERT INTO `sc` VALUES ('10', '1003', '5', '67');
INSERT INTO `sc` VALUES ('11', '1004', '5', '78');
INSERT INTO `sc` VALUES ('12', '1004', '3', '67');
INSERT INTO `sc` VALUES ('13', '1004', '4', '49');
INSERT INTO `sc` VALUES ('14', '1005', '4', '76');
INSERT INTO `sc` VALUES ('15', '1005', '2', '84');
INSERT INTO `sc` VALUES ('16', '1005', '3', '35');
INSERT INTO `sc` VALUES ('17', '1006', '3', '54');
INSERT INTO `sc` VALUES ('18', '1006', '2', '76');
INSERT INTO `sc` VALUES ('19', '1006', '1', '56');
INSERT INTO `sc` VALUES ('20', '1007', '1', '56');
INSERT INTO `sc` VALUES ('21', '1007', '7', '88');
INSERT INTO `sc` VALUES ('22', '1007', '2', '89');
INSERT INTO `sc` VALUES ('23', '1007', '3', '57');
INSERT INTO `sc` VALUES ('24', '1007', '4', '99');
INSERT INTO `sc` VALUES ('25', '1007', '5', '85');
INSERT INTO `sc` VALUES ('26', '1008', '1', '76');
INSERT INTO `sc` VALUES ('27', '1008', '2', '44');
INSERT INTO `sc` VALUES ('28', '1008', '4', '87');
INSERT INTO `sc` VALUES ('29', '1008', '5', '33');
INSERT INTO `sc` VALUES ('30', '1002', '6', '65');
INSERT INTO `sc` VALUES ('31', '1002', '7', '90');
INSERT INTO `sc` VALUES ('32', '1006', '6', '67');

DROP TABLE IF EXISTS `teacher`;
CREATE TABLE `teacher` (
  `TId` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `TName` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`TId`)
) ENGINE=InnoDB AUTO_INCREMENT=2006 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of teacher
-- ----------------------------
INSERT INTO `teacher` VALUES ('2001', '李华');
INSERT INTO `teacher` VALUES ('2002', '王力宏');
INSERT INTO `teacher` VALUES ('2003', '叶平');
INSERT INTO `teacher` VALUES ('2004', '王倩倩');
INSERT INTO `teacher` VALUES ('2005', '李莉莉');

View Code

2 T-SQL试题

1、查询“001”课程比“002”课程成绩高的所有学生的学号；

select a.S# 
from (select s#,score from SC where C#='001') a,(select s#,score from SC where C#='002') b 
where a.score>b.score and a.s#=b.s#;

-- mysql
SELECT a.SId 
from (select SId,score from sc where CId='1') a,(select SId,score from sc where CId='2') b 
where a.SId=b.SId and a.score>b.score;

2、查询平均成绩大于60分的同学的学号和平均成绩；

select S#,avg(score) 
from sc 
group by S# 
having avg(score) >60;

-- mysql
select SID, AVG(score)
from SC
GROUP BY SID
HAVING AVG(score)>60;

3、查询所有同学的学号、姓名、选课数、总成绩；

select Student.S#,Student.Sname,count(SC.C#),sum(score) 
from Student left Outer join SC on Student.S#=SC.S# 
group by Student.S#,Sname

select student.SId,student.Sname,count(SC.Cid),sum(SC.score) 
from student,SC
where student.SId=SC.SId
group by student.SId

4、查询姓“李”的老师的个数；

select Student.S#,Student.Sname,count(SC.C#),sum(score) 
from Student left Outer join SC on Student.S#=SC.S# 
group by Student.S#,Sname

select COUNT(DISTINCT TName) 
from Teacher
where TName like '李%'

5、查询没学过“叶平”老师课的同学的学号、姓名；

select Student.S#,Student.Sname 
from Student 
where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='叶平');

select SId,Sname from Student where SId not in
(SELECT DISTINCT SC.SId from SC,Course,Teacher where SC.CId=Course.CId and Course.TId=Teacher.TId and Teacher.Tname='叶平')

6、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名；

select Student.S#,Student.Sname 
from Student,SC 
where Student.S#=SC.S# and SC.C#='001'and exists( Select * from SC  SC_2 where SC_2.S#=SC.S# and SC_2.C#='002');

解析： 使用 exists关键字，用来判断是否存在的，当exists（查询）中的查询结果存在时则返回真，否则返回假。

7、查询学过“叶平”老师所教的所有课的同学的学号、姓名；

select S#,Sname 
from Student 
where S# in 
  (select S# 
   from SC ,Course ,Teacher 
   where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='叶平' group by S# having count(SC.C#)=(select count(C#) from Course,Teacher where Teacher.T#=Course.T# and Tname='叶平'));

解析：跟第5题的要求正好相反，且难度提高了。所有课程通过groupby 后的having条件实现

8、查询课程编号“002”的成绩比课程编号“001”课程低的所有同学的学号、姓名；

Select S#,Sname 
from (select Student.S#,Student.Sname,score ,(select score from SC SC_2 where SC_2.S#=Student.S# and SC_2.C#='002') score2 from Student,SC where Student.S#=SC.S# and C#='001') S_2 
where score2 <score;

解析：跟第1题基本一样的问题，只是实现方式不一样。第1题的实现方式更适合我。

9、查询所有课程成绩小于60分的同学的学号、姓名；

select S#,Sname 
from Student 
where S# not in (select DISTINCT(Student.S#) from Student,SC where S.S#=SC.S# and score>=60);

解析：反过来说：没有一门课程大于等于60

10、查询没有学全所有课的同学的学号、姓名；

select Student.S#,Student.Sname 
from Student,SC 
where Student.S#=SC.S# group by Student.S#,Student.Sname having count(C#) <(select count(C#) from Course);

11、查询至少有一门课与学号为“1001”的同学所学相同的同学的学号和姓名；

select S#,Sname 
from Student,SC 
where Student.S#=SC.S# and C# in (select C# from SC where S#='1001');

13、把“SC”表中“叶平”老师教的课的成绩都更改为此课程的平均成绩；

update SC 
set score=(select avg(SC_2.score) from SC SC_2 where SC_2.C#=SC.C#)
from Course,Teacher 
where Course.C#=SC.C# and Course.T#=Teacher.T# and Teacher.Tname='叶平');

-- mysql
update SC ,(SELECT SC.CId,AVG(SC.score) avgScore from SC,Course,Teacher where SC.CId=Course.CId and Course.TId=Teacher.TId and Teacher.Tname='叶平' GROUP BY SC.CId) a
set SC.score=a.avgScore
where SC.CId=a.CId

14、查询和“1002”号的同学学习的课程完全相同的其他同学学号和姓名；

select S#
from SC 
where C# in (select C# from SC where S#='1002') 
group by S# 
having count(*)=(select count(*) from SC where S#='1002');

15、删除学习“叶平”老师课的SC表记录；

Delete SC  
from course ,Teacher   
where Course.C#=SC.C# and Course.T#= Teacher.T# and Tname='叶平';

16、向SC表中插入一些记录，这些记录要求符合以下条件：没有上过编号“003”课程的同学学号、“002”号课的平均成绩；

Insert into SC (S#,C#,score) 
values（select S#,'002',(Select avg(score)  from SC where C#='002') from Student where S# not in (Select S# from SC where C#='003')）;

17、按平均成绩从高到低显示所有学生的“数据库”、“企业管理”、“英语”三门的课程成绩，按如下形式显示：学生ID,,数据库,企业管理,英语,有效课程数,有效平均分

SELECT S# as 学生ID 
    ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='004') AS 数据库 
    ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='001') AS 企业管理 
    ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='006') AS 英语 
    ,COUNT(*) AS 有效课程数, AVG(t.score) AS 平均成绩 
FROM SC AS t 
GROUP BY S# 
ORDER BY avg(t.score)

18、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分
    SELECT L.C# As 课程ID,L.score AS 最高分,R.score AS 最低分
    FROM SC L ,SC AS R
    WHERE L.C# = R.C# and
        L.score = (SELECT MAX(IL.score)
                      FROM SC AS IL,Student AS IM
                      WHERE L.C# = IL.C# and IM.S#=IL.S#
                      GROUP BY IL.C#)
        AND
        R.Score = (SELECT MIN(IR.score)
                      FROM SC AS IR
                      WHERE R.C# = IR.C#
                  GROUP BY IR.C#
                    );

-- mysql
SELECT DISTINCT
CId '课程ID',
(select Max(score) from SC SC1 where SC1.CId=SC.CId group by CId) '最高分',
(select Min(score) from SC SC2 where SC2.CId=SC.CId group by CId) '最低分 '
from SC order by CId;

19、按各科平均成绩从低到高和及格率的百分数从高到低顺序

SELECT t.C# AS 课程号,max(course.Cname)AS 课程名,isnull(AVG(score),0) AS 平均成绩 ,100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数 
FROM SC T,Course 
where t.C#=course.C# 
GROUP BY t.C# 
ORDER BY 100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC

SELECT t.CId AS '课程号',max(course.Cname)AS '课程名',ifnull(AVG(score),0) AS '平均成绩' ,100 * SUM(CASE WHEN ifnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS '及格百分数' 
FROM SC T,Course 
where t.CId=course.CId 
GROUP BY t.CId 
ORDER BY 100 * SUM(CASE WHEN ifnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC

20、查询如下课程平均成绩和及格率的百分数(用"1行"显示): 企业管理（001），马克思（002），OO&UML （003），数据库（004）

SELECT SUM(CASE WHEN C# ='001' THEN score ELSE 0 END)/SUM(CASE C# WHEN '001' THEN 1 ELSE 0 END) AS 企业管理平均分 
    ,100 * SUM(CASE WHEN C# = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '001' THEN 1 ELSE 0 END) AS 企业管理及格百分数 
    ,SUM(CASE WHEN C# = '002' THEN score ELSE 0 END)/SUM(CASE C# WHEN '002' THEN 1 ELSE 0 END) AS 马克思平均分 
    ,100 * SUM(CASE WHEN C# = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '002' THEN 1 ELSE 0 END) AS 马克思及格百分数 
    ,SUM(CASE WHEN C# = '003' THEN score ELSE 0 END)/SUM(CASE C# WHEN '003' THEN 1 ELSE 0 END) AS UML平均分 
    ,100 * SUM(CASE WHEN C# = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '003' THEN 1 ELSE 0 END) AS UML及格百分数 
    ,SUM(CASE WHEN C# = '004' THEN score ELSE 0 END)/SUM(CASE C# WHEN '004' THEN 1 ELSE 0 END) AS 数据库平均分 
    ,100 * SUM(CASE WHEN C# = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '004' THEN 1 ELSE 0 END) AS 数据库及格百分数 
FROM SC

22、查询如下课程成绩第 3 名到第 6 名的学生成绩单：企业管理（001），马克思（002），UML （003），数据库（004）
[学生ID],[学生姓名],企业管理,马克思,UML,数据库,总分

SELECT DISTINCT top 3 
    SC.S# As 学生学号, 
    Student.Sname AS 学生姓名 , 
    T1.score AS 企业管理, 
    T2.score AS 马克思, 
    T3.score AS UML, 
    T4.score AS 数据库, 
    ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 总分 
    FROM Student,SC 
        LEFT JOIN SC AS T1 ON SC.S# = T1.S# AND T1.C# = '001' 
        LEFT JOIN SC AS T2 ON SC.S# = T2.S# AND T2.C# = '002' 
        LEFT JOIN SC AS T3 ON SC.S# = T3.S# AND T3.C# = '003' 
        LEFT JOIN SC AS T4 ON SC.S# = T4.S# AND T4.C# = '004' 
    WHERE student.S#=SC.S# and ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) 
        NOT IN 
        (SELECT 
            DISTINCT 
            TOP 15 WITH TIES 
            ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) 
        FROM sc 
            LEFT JOIN sc AS T1 
                      ON sc.S# = T1.S# AND T1.C# = 'k1' 
            LEFT JOIN sc AS T2 
                      ON sc.S# = T2.S# AND T2.C# = 'k2' 
            LEFT JOIN sc AS T3 
                      ON sc.S# = T3.S# AND T3.C# = 'k3' 
            LEFT JOIN sc AS T4 
                      ON sc.S# = T4.S# AND T4.C# = 'k4' 
        ORDER BY ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) DESC);

23、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]

SELECT SC.C# as 课程ID, Cname as 课程名称 
    ,SUM(CASE WHEN score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) AS [100 - 85] 
    ,SUM(CASE WHEN score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) AS [85 - 70] 
    ,SUM(CASE WHEN score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) AS [70 - 60] 
    ,SUM(CASE WHEN score < 60 THEN 1 ELSE 0 END) AS [60 -] 
FROM SC,Course 
where SC.C#=Course.C# 
GROUP BY SC.C#,Cname;

24、查询学生平均成绩及其名次

SELECT 1+(SELECT COUNT(distinct 平均成绩) FROM (SELECT S#,AVG(score) AS 平均成绩 FROM SCGROUP BY S# ) AS T1 WHERE 平均成绩 > T2.平均成绩) as 名次, S# as 学生学号,平均成绩 
FROM (SELECT S#,AVG(score) 平均成绩 FROM SC GROUP BY S# ) AS T2 
ORDER BY 平均成绩 desc;

25、查询各科成绩前三名的记录:(不考虑成绩并列情况)

SELECT t1.S# as 学生ID,t1.C# as 课程ID,Score as 分数 
FROM SC t1 
WHERE score IN (SELECT TOP 3 score FROM SC WHERE t1.C#= C# ORDER BY score DESC ) 
ORDER BY t1.C#;

31、1981年出生的学生名单(注：Student表中Sage列的类型是datetime)

select Sname, CONVERT(char (11),DATEPART(year,Sage)) as age 
from student 
where CONVERT(char(11),DATEPART(year,Sage))='1981';

42、查询不同课程成绩相同的学生的学号、课程号、学生成绩

select distinct A.S#,B.score from SC A ,SC B where A.Score=B.Score and A.C# <>B.C# ;

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原文地址：https://www.cnblogs.com/Ming8006/p/4515211.html