SQL筆試題：下面是學生表(student)的結構說明字段名稱字段解釋字段類型字段長度約束

s_id學號字符10PK

s_name學生姓名字符50Not?null

s_age學生年齡數(shù)值3Not?null

s-sex學生性別字符(男：1女：0)1Not?null

下面是教師表(Teacher?)的結構說明字段名稱字段解釋字段類型字段長度約束

t_id教師編號字符10PK

t_name教師名字字符50Not?null

下面是課程表(Course)的結構說明字段名稱字段解釋字段類型字段長度約束

c_id課程編號字符10PK

c_name課程名字字符50Not?null

t_id教師編號字符10Not?null

下面是成績表(SC)的結構說明字段名稱字段解釋字段類型字段長度約束

s_id學號字符10PK

c_id課程編號字符10Not?null

score成績數(shù)值3Not?null

1、查詢“001”課程比“002”課程成績高的所有學生的學號；

select a.s_id from (select s_id,score from SC where C_ID='001') a,(select s_id,score

from SC where C_ID='002') b

where a.score>b.score and a.s_id=b.s_id;

2、查詢平均成績大于60分的同學的學號和平均成績；

select S_ID,avg(score)

from sc

group by S_ID having avg(score) >60;

3、查詢所有同學的學號、姓名、選課數(shù)、總成績；

select Student.S_ID,Student.Sname,count(SC.C_ID),sum(score)

from Student left Outer join SC on Student.S_ID=SC.S_ID

group by Student.S_ID,Sname

4、查詢姓“李”的老師的個數(shù)；

select count(distinct(Tname))

from Teacher

where Tname like '李%';

5、查詢沒學過“葉平”老師課的同學的學號、姓名；

select Student.S_ID,Student.Sname

from Student

where S_ID not in (select distinct( SC.S_ID) from SC,Course,Teacher where SC.C_ID=Course.C_ID and Teacher.T#=Course.T# and Teacher.Tname='葉平');

6、查詢學過“001”并且也學過編號“002”課程的同學的學號、姓名；

elect Student.S_ID,Student.Sname from Student,SC where Student.S_ID=SC.S_ID and SC.C_ID='001'and exists( Select * from SC as SC_2 where SC_2.S_ID=SC.S_ID and SC_2.C_ID='002');

7、查詢學過“葉平”老師所教的所有課的同學的學號、姓名；

select S_ID,Sname

from Student

where S_ID in (select S_ID from SC ,Course ,Teacher where SC.C_ID=Course.C_ID and Teacher.T#=Course.T# and Teacher.Tname='葉平' group by S_ID having count(SC.C_ID)=(select count(C_ID) from Course,Teacher where Teacher.T#=Course.T# and Tname='葉平'));

8、查詢課程編號“002”的成績比課程編號“001”課程低的所有同學的學號、姓名；

Select S_ID,Sname from (select Student.S_ID,Student.Sname,score ,(select score from SC SC_2 where SC_2.S_ID=Student.S_ID and SC_2.C_ID='002') score2

from Student,SC where Student.S_ID=SC.S_ID and C_ID='001') S_2 where score2 < score;

9、查詢所有課程成績小于60分的同學的學號、姓名；

select S_ID,Sname

from Student

where S_ID not in (select S.S_ID from Student AS S,SC where S.S_ID=SC.S_ID and score>60);

10、查詢沒有學全所有課的同學的學號、姓名；

select Student.S_ID,Student.Sname

from Student,SC

where Student.S_ID=SC.S_ID group by Student.S_ID,Student.Sname having count(C_ID)

11、查詢至少有一門課與學號為“1001”的同學所學相同的同學的學號和姓名；

select distinct S_ID,Sname from Student,SC where?Student.S_ID=SC.S_ID and SC.C_ID in (select C_ID from SC where S_ID='1001');

12、查詢至少學過學號為“001”同學所有一門課的其他同學學號和姓名；

select distinct SC.S_ID,Sname

from Student,SC

where Student.S_ID=SC.S_ID and C_ID in (select C_ID from SC where S_ID='001');

總結

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