SQL筆試題：下面是學(xué)生表(student)的結(jié)構(gòu)說(shuō)明字段名稱字段解釋字段類型字段長(zhǎng)度約束

s_id學(xué)號(hào)字符10PK

s_name學(xué)生姓名字符50Not?null

s_age學(xué)生年齡數(shù)值3Not?null

s-sex學(xué)生性別字符(男：1女：0)1Not?null

下面是教師表(Teacher?)的結(jié)構(gòu)說(shuō)明字段名稱字段解釋字段類型字段長(zhǎng)度約束

t_id教師編號(hào)字符10PK

t_name教師名字字符50Not?null

下面是課程表(Course)的結(jié)構(gòu)說(shuō)明字段名稱字段解釋字段類型字段長(zhǎng)度約束

c_id課程編號(hào)字符10PK

c_name課程名字字符50Not?null

t_id教師編號(hào)字符10Not?null

下面是成績(jī)表(SC)的結(jié)構(gòu)說(shuō)明字段名稱字段解釋字段類型字段長(zhǎng)度約束

s_id學(xué)號(hào)字符10PK

c_id課程編號(hào)字符10Not?null

score成績(jī)數(shù)值3Not?null

1、查詢“001”課程比“002”課程成績(jī)高的所有學(xué)生的學(xué)號(hào)；

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(jī)大于60分的同學(xué)的學(xué)號(hào)和平均成績(jī)；

select S_ID,avg(score)

from sc

group by S_ID having avg(score) >60;

3、查詢所有同學(xué)的學(xué)號(hào)、姓名、選課數(shù)、總成績(jī)；

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(gè)數(shù)；

select count(distinct(Tname))

from Teacher

where Tname like '李%';

5、查詢沒(méi)學(xué)過(guò)“葉平”老師課的同學(xué)的學(xué)號(hào)、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(xué)過(guò)“001”并且也學(xué)過(guò)編號(hào)“002”課程的同學(xué)的學(xué)號(hào)、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(xué)過(guò)“葉平”老師所教的所有課的同學(xué)的學(xué)號(hào)、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(hào)“002”的成績(jī)比課程編號(hào)“001”課程低的所有同學(xué)的學(xué)號(hào)、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(jī)小于60分的同學(xué)的學(xué)號(hào)、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(méi)有學(xué)全所有課的同學(xué)的學(xué)號(hào)、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(xué)號(hào)為“1001”的同學(xué)所學(xué)相同的同學(xué)的學(xué)號(hào)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(xué)過(guò)學(xué)號(hào)為“001”同學(xué)所有一門課的其他同學(xué)學(xué)號(hào)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(jié)

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