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1.?(簡(jiǎn)答題, 40分)

假設(shè)學(xué)生-課程數(shù)據(jù)庫(kù)關(guān)系模式如下所示:

Student（S#，Sname，Sage，Ssex）表示學(xué)生關(guān)系，屬性為學(xué)號(hào)、姓名、年齡、性別；

Course（C#，Cname，Ccredit）表示課程關(guān)系，屬性為課程號(hào)、課程名，學(xué)分；

SC（S#，C#，Score）表示選修關(guān)系，屬性為學(xué)號(hào)、課程號(hào)、考試成績(jī)；

各表中數(shù)據(jù)見(jiàn)下面表格所示，請(qǐng)說(shuō)明：

（1）下面SQL語(yǔ)句的功能。

（2）執(zhí)行過(guò)程。

（3）查詢結(jié)果。

本題滿分40分，其中SQL語(yǔ)句功能10分；語(yǔ)句的執(zhí)行過(guò)程20分，請(qǐng)從SQL語(yǔ)句各子句的執(zhí)行次序角度分析該語(yǔ)句的執(zhí)行過(guò)程；查詢結(jié)果10分，可用表格形式給出。

SELECT? Student.S#,Sname,Sage,SUM(Ccredit) SumCredit

FROM Student,SC,Course

WHERE Student.S#=SC.S# AND Course.C#=SC.C# AND Ssex='女' AND Score>=60

GROUP BY Student.S#,Sname,Sage Having Count(*)>2

ORDER BY SumCredit DESC,Sname ASC;

create table Student( S# char(5) primary key, Sname char(20), Sage number, Ssex char(2) ); create table Course( C# char(5)primary key, Cname char(20), Ccredit char(5) ); create table SC( S# char(5), C# char(5), Score number, primary key(S#,C#), foreign key(S#) references Student(S#), foreign key(C#) references Course(C#) ); insert into Student values('101','李紅梅',20,'女'); insert into Student values('102','李琳琳',19,'女'); insert into Student values('103','張強(qiáng)',20,'男'); insert into Student values('104','譚莉',21,'女'); insert into Student values('105','趙茂盛',18,'男'); insert into Student values('106','李曉光',19,'男'); insert into Student values('107','何虹',20,'女'); insert into Student values('108','王美麗',21,'女'); insert into Student values('109','吳嫦娥',29,'女'); insert into COURSE values('1','高級(jí)語(yǔ)言程序設(shè)計(jì)','3'); insert into COURSE values('2','大學(xué)英語(yǔ)1','3'); insert into COURSE values('3','數(shù)據(jù)結(jié)構(gòu)','3.5'); insert into COURSE values('4','操作系統(tǒng)原理','3'); insert into COURSE values('5','Python程序設(shè)計(jì)','2'); insert into COURSE values('6','高等數(shù)學(xué)','4.5'); insert into SC values ('101','1',80); insert into SC values ('101','2',75); insert into SC values ('101','3',90); insert into SC values ('101','4',87); insert into SC values ('102','1',85); insert into SC values ('102','3',75); insert into SC values ('102','6',90); insert into SC values ('103','1',70); insert into SC values ('103','2',65); insert into SC values ('103','3',85); insert into SC values ('104','2',75); insert into SC values ('104','3',88); insert into SC values ('104','4',77); insert into SC values ('105','1',90); insert into SC values ('105','2',87); insert into SC values ('106','1',72); insert into SC values ('107','2',76); insert into SC values ('108','1',75); insert into SC values ('108','2',55); insert into SC values ('108','3',70); insert into SC values ('109','1',75); insert into SC values ('109','3',75); insert into SC values ('109','5',75); SELECT Student.S#,Sname,Sage,SUM(Ccredit) SumCreditFROM Student,SC,CourseWHERE Student.S#=SC.S# AND Course.C#=SC.C# AND Ssex='女' AND Score>=60GROUP BY Student.S#,Sname,Sage Having Count(*)>2ORDER BY SumCredit DESC,Sname ASC;

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