Introduction to database system experiment report answer Experiment 6: advanced query of data table

Experiment six ： Data table advanced query

One 、 The experiment purpose

1.    master SELECT The basic syntax of the statement and the expression method of query conditions ;

2.    Master the connection query method of data table ;

3.    Master the representation and use of nested queries ;

4.    Master the representation and use of set query

Two 、 Experimental hours

2 Class hours

3、 ... and 、 The experimental requirements

1.    understand SELECT The basic syntax format and execution method of the statement ;

2.    Understand the representation and use of connection query ;

3.    Master the methods of nested query and set query ;

4.    Finish the experiment report ;

Four 、 Experimental content

By experiment 5 Database based , Please use T-SQL Statement implementation performs the following operations ：

1.    Search the first name in the list 2 The word is ‘ towards ’ Name and student number of the student and elective course number 、 Course name ;

select sname,XSKC.student.sno,XSKC.sc.cno,cname

from XSKC.student,XSKC.sc,XSKC.course

where XSKC.student.sno=XSKC.sc.sno and XSKC.sc.cno=XSKC.course.cno and sname like'_ towards %';

2.    List of electives ‘ mathematics ’ perhaps ‘ College English ’ The student number of 、 full name 、 department 、 Elective course number and grade ;

select XSKC.student.sno,sname,sdept,XSKC.sc.cno,grade

from XSKC.student,XSKC.sc,XSKC.course

where XSKC.student.sno=XSKC.sc.sno and XSKC.sc.cno=XSKC.course.cno and XSKC.sc.cno='2'or XSKC.sc.cno='8';

3.    Query and ‘ tension ’( Suppose the name is unique ) Information about all students of different ages ;

select*

from XSKC.student

where sage !=(

           select sage

            from XSKC.student

            where sname=' tension ');

4.    according to “ Student number , full name , department , Credits completed ” List the students' credits in the order of . Among them, the completed courses are divided into the sum of credits of courses that have passed the examination ;

select XSKC.student.sno,sname,sdept,sum(ccredit) Credits completed

from XSKC.student,XSKC.sc,XSKC.course

where XSKC.student.sno=XSKC.sc.sno and XSKC.sc.cno=XSKC.course.cno and XSKC.sc.grade>='60'

groupby XSKC.student.sno,XSKC.student.sname,XSKC.student.sdept

5.    Find the student number of students who have taken at least one of the same elective courses as tension 、 Name and course number ;

select XSKC.student.sno,sname,cno

from XSKC.student,XSKC.sc

where XSKC.student.sno=XSKC.sc.sno and XSKC.sc.cno =any

(select cno from XSKC.sc,XSKC.student where XSKC.sc.sno=XSKC.student.sno and sname=' tension ')and sname !=' tension '

6.    Query the course number of the course selected by only one student 、 Course name ;

select XSKC.sc.cno,cname

from XSKC.sc,XSKC.course

where XSKC.sc.cno=XSKC.course.cno

groupby XSKC.sc.cno,cname

havingcount(*)='1';

7.    Use nested query to find out “ data structure ” Student number and name of the course ;

select XSKC.student.sno,sname

from XSKC.student,XSKC.sc

where cno =(select cno from XSKC.course where cname=' data structure ')

8.    Use nested queries to query other departments whose age is less than CS The name of a student in the Department 、 Age and department ;

select sname,sage,sdept

from XSKC.student

where sage<any(select sage

                 from XSKC.student

                  where sdept='cs')

       and sdept !='CS';

9.    Use ANY、ALL Inquire about , List more than... In other departments WM The names of all the younger students in the Department ;

select sname

from XSKC.student

where sage<ALL(select sage

                 from XSKC.student

                  where sdept='WM')

       and sdept !='WM';

10.   Use join queries and nested queries, respectively , List and ‘ tension ’ Information about students in a department ;

Self connect :

select two.*

from XSKC.student as one,XSKC.student as two

where one.sdept=two.sdept and one.sname=' tension 'and two.sname !=' tension ';

nesting :

select*

from XSKC.student

where sdept =(select sdept

                 from XSKC.student

                  where sname=' tension ')

       and sname !=' tension ';

11.   List using set query CS The student number and name of the students of the Department and the students of female sex ;

select sname

from XSKC.student

where sdept ='CS'

union

select sname

from XSKC.student

where ssex =' Woman ';

12.   List using set query CS Students of the Department are no older than 19 The intersection of a year old student 、 Difference set ;

intersection :

select*

from XSKC.student

where sdept ='CS'

intersect

select*

from XSKC.student

where sage <='19';

Difference set :

select*

from XSKC.student

where sdept ='CS'

except

select*

from XSKC.student

where sage <='19';

5、 ... and 、 The experimental steps

Command mode ： stay 【SQL Server Management Studio】 Select... At the top left of the window 【 New query 】 Button , start-up SQL Editor window , Enter... At the cursor T-SQL sentence , single click 【 perform 】 Button .