1. There are 3 data tables in the student course selection database:
S(sno,sname,birthday,sdeptartment,tel,sex)，
SC(sno,cno,grade)， C(cno,cname,teacher,pcno)。
2. Use SQL Server Management Studio to insert the following data into the three tables of the database S_C: student table S:
| sno |
takes off |
birthday |
sdeptartment |
tel |
sex |
| J0401 |
Li Jun |
1981-2-12 |
computer science |
0576-85123464 |
male |
| J0402 |
Liu Chen |
1980-5-22 |
Department of Mathematics |
0576-85123466 |
female |
| J0403 |
Wang Min |
1980-4-28 |
computer science |
0576-85123464 |
female |
| J0404 |
Zhang Li |
1979-9-8 |
computer science |
0576-85123464 |
male |
Curriculum C:
| cno |
cname |
teacher |
pcno |
| C01 |
database |
GUO |
C03 |
| C02 |
VB |
LIU |
C03 |
| C03 |
Computer Basics |
LI |
|
| C04 |
math |
WANG |
|
| C05 |
data structure |
ZHANG |
C03 |
| C06 |
C language |
CHEN |
C03 |
Transcript SC:
| sno |
cno |
grade |
| J0401 |
C05 |
92 |
| J0401 |
C06 |
85 |
| J0401 |
C02 |
88 |
| J0401 |
C01 |
90 |
| J0402 |
C04 |
80 |
| J0403 |
C02 |
76 |
| J0404 |
C03 |
88 |
3. In the query window, use the SELECT statement to complete the following query:
1) List " Wang Min " information ;
Sql statement: SELECT * FROM S WHERE sname=' Wang Min ';
Query result description :
2) The student number, name and age of the student are displayed in the student table ;
Sql语句：SELECT sno,sname,DATEDIFF(yy,birthday,getdate()) AS age FROM S;
Query result description :
3) Display all boys information ;
Sql statement: SELECT * FROM S WHERE sex = ' male' ;
Query result description :
4) Display all students in the Department of Computer Science, sorted by birthday in descending order;
Sql statement : SELECT * FROM S ORDER BY birthday DESC ;
Query result description :
5) Display the course information of all course names containing "Number" ;
Sql statement: SELECT * FROM C WHERE cname LIKE '% number%' ;
Query result description :
6) Display the course number and course name whose pcno is "C03";
Sql语句：SELECT * FROM C WHERE pcno='C03';
Query result description :
7) Display the average grade of the course whose course number is " C02 " ;
Sql语句：SELECT AVG(grade)FROM SC WHERE cno='C02';
Query result description :
8) Retrieve the birth year of each student ;
Sql statement: SELECT * FROM S ;
Query result description :
9) Retrieve the student's name and year of birth in S , and the output column names are STUDENT_NAME and BIRTH_YEAR respectively ;
Sql语句：SELECT sname AS STUDENT_NAME, birthday AS BIRTH_YEAR FROM S ;
Query result description :
10) Display the highest score of the course whose course number is " C02 " ;
Sql语句：SELECT MAX(grade) FROM SC WHERE cno='C02';
Query result description :
11) Find the number of students who have taken each course ;
Sql语句：SELECT cno,COUNT(sno) FROM SC GROUP BY cno ;
Query result description :
12) In SC , find the student numbers and scores of the students who took the elective course C01 , and sort the results in descending order of scores ;
Sql语句：SELECT sno,grade FROM SC WHERE cno='C01' ORDER BY grade DESC;
Query result description :
13) Find each student's student number and the average grade of elective courses ;
Sql语句：SELECT sno, AVG(grade) FROM SC GROUP BY sno;
Query result description :
14) List all course numbers and grades of students whose student ID is " J0401 ", sorted in descending order of grades ;
Sql语句：SELECT cno ,grade FROM SC WHERE sno='J0401'ORDER BY grade DESC;
Query result description :
15) List all student numbers and course numbers with scores lower than (including) 85 points ;
Sql语句：SELECT sno,cno FROM SC WHERE grade<=85;
Query result description :
16) List the highest grades of each classmate ;
Sql语句：SELECT sno,MAX(grade) FROM SC GROUP BY sno;
Query result description :
17) List the minimum grades for each course ;
Sql语句：SELECT sno,MIN(grade) FROM SC GROUP BY sno;
Query result description :
18) Retrieve the records of students with the surname "Wang" in S ;
Sql statement: SELECT * FROM S WHERE sname LIKE ' King%' ;
Query result description :
19) List all students born in May ;
Sql语句：SELECT * FROM S WHERE MONTH(birthday)='5';
Query result description :
20) Count the number of courses taken by students ;
Sql语句：SELECT COUNT(DISTINCT cno) FROM SC ;
Query result description :
21) Find the average age of the students who take the C04 course ;
Sql语句：SELECT AVG(DATEDIFF(yy,birthday,getdate())) AS AVERAGE FROM S,SC WHERE cno='C04' ;
Query result description :
22) Ask for course information of courses taught by LIU teachers ;
Sql语句：SELECT * FROM C WHERE teacher='LIU' ;
Query result description :
23) List girls whose names contain Min ;
Sql statement: SELECT * FROM S WHERE sname LIKE '% min%' ;
Query result description :
24) Find the oldest boy ;
Sql statement: SELECT *
FROM S
WHERE SEX='男'AND DATEDIFF(yy,birthday,getdate()) >= ANY(SELECT MAX(DATEDIFF(yy,birthday,getdate()))
FROM S ) ;
Query result description :
Get a part of a date:
YEAR('2022-3-11') --Year
MONTH('2022-3-11') --Month
DAY('2022-3-11') --Day
DATEPART ( datepart , date )
DATEPART(MM,' 2022-3-11')
year yy, yyyy
quarter qq, q
month mm, m
a certain day of the year dy, y
date dd, d
week wk, ww
weekday dw
hour hh
minute mi, n
second ss, s
millisecond ms