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MySQL exercises elementary 45 questions (Unified table)
2022-07-26 18:41:00 【Piglet vs Hengge】
https://www.jianshu.com/p/dffd40d06e3c?u_atoken=347d4392-252a-4b45-a678-bcec250f9e04&u_asession=01eMtP4JqegFoAlsURoakpOGrbcerjLJ_zN8f1aUZcmXP4RFYHr8mgHddXP2E4de3jX0KNBwm7Lovlpxjd_P_q4JsKWYrT3W_NKPr8w6oU7K_rPtya4yy2JhGPHuukmz9-nHmbkqVcEgdObpAroqY1_GBkFo3NEHBv0PZUm6pbxQU&u_asig=05C37JabxAuQ31mDFqjIByfyLzE6L1QI2GClS_4S2oH_CRohkzGM9lmVwfVnmUENav6UAlwIGd0n5-OXsYaCKG3INIU3CDihJTJ51P3S6kkIKOa1ngTAW4FxeLWO19IXEBBGQDh9HMF8GBnsGLJ80uwzZlCYPl5VPi0r_5fKCzBJb9JS7q8ZD7Xtz2Ly-b0kmuyAKRFSVJkkdwVUnyHAIJzZmc6KEtJ8Ac7iz7KRn3KyaF2ULn3BedZgqLkWUaPI706xbSxAaWh9ph0bRUFW-6vO3h9VXwMyh6PgyDIVSG1W_zuO1CFQeRvItTQZoN37h469EgyhIIU9G134I4HWFmMM2zxaRDUMsexOWGXS4DANDdkV_2vuXIqfq23xGu1PxmmWspDxyAEEo4kbsryBKb9Q&u_aref=XH4TVtlUH3sT%2FSBszLSI6AAx8uI%3D（1） Create a database sql_exercise01
（2） establish 4 Data tables ：
① Student list （Student）
② The curriculum （Course）
③ League tables （Score）
④ Teacher information sheet （Teacher）
The design is as follows. Complete the following information for the four tables ：
Table structure ：
# Student list
mysql> desc student;
+-----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| Sno | varchar(20) | NO | PRI | NULL | |
| Sname | varchar(20) | NO | | NULL | |
| Ssex | varchar(20) | NO | | NULL | |
| Sbirthday | datetime | YES | | NULL | |
| Class | varchar(20) | YES | | NULL | |
+-----------+-------------+------+-----+---------+-------+
5 rows in set (0.00 sec)
# Teachers list
mysql> desc teacher;
+-----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| Tno | varchar(20) | NO | PRI | NULL | |
| Tname | varchar(20) | NO | | NULL | |
| Tsex | varchar(20) | NO | | NULL | |
| Tbirthday | datetime | YES | | NULL | |
| Prof | varchar(20) | YES | | NULL | |
| Depart | varchar(20) | NO | | NULL | |
+-----------+-------------+------+-----+---------+-------+
6 rows in set (0.00 sec)
mysql> # The curriculum
mysql> desc course;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| Cno | varchar(20) | NO | PRI | NULL | |
| Cname | varchar(20) | NO | | NULL | |
| Tno | varchar(20) | NO | MUL | NULL | |
+-------+-------------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql> # League tables
mysql> desc score;
+--------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+---------------+------+-----+---------+-------+
| Sno | varchar(20) | NO | MUL | NULL | |
| Cno | varchar(20) | NO | MUL | NULL | |
| Degree | decimal(10,0) | YES | | NULL | |
+--------+---------------+------+-----+---------+-------+
3 rows in set (0.00 sec)Table data
mysql> # Student list
mysql> select *from student;
+-----+--------+------+---------------------+-------+
| Sno | Sname | Ssex | Sbirthday | Class |
+-----+--------+------+---------------------+-------+
| 101 | Li Jun | male | 1976-02-20 00:00:00 | 95033 |
| 103 | Lu Jun | male | 1974-06-03 00:00:00 | 95031 |
| 105 | Kuang Ming | male | 1975-10-02 00:00:00 | 95031 |
| 107 | Wang Li | Woman | 1976-01-23 00:00:00 | 95033 |
| 108 | Zeng Hua | male | 1977-09-01 00:00:00 | 95033 |
| 109 | Wang Fang | Woman | 1975-02-10 00:00:00 | 95031 |
+-----+--------+------+---------------------+-------+
6 rows in set (0.00 sec)
mysql> # The curriculum
mysql> select *from course;
+-------+-----------------+-----+
| Cno | Cname | Tno |
+-------+-----------------+-----+
| 3-105 | Introduction to computer | 825 |
| 3-245 | operating system | 804 |
| 6-166 | digital circuit | 856 |
| 9-888 | Advanced mathematics | 831 |
+-------+-----------------+-----+
4 rows in set (0.00 sec)
mysql> # League tables
mysql> select *from score;
+-----+-------+--------+
| Sno | Cno | Degree |
+-----+-------+--------+
| 103 | 3-245 | 86 |
| 105 | 3-245 | 75 |
| 109 | 3-245 | 68 |
| 103 | 3-105 | 92 |
| 105 | 3-105 | 88 |
| 109 | 3-105 | 76 |
| 103 | 3-105 | 64 |
| 105 | 3-105 | 91 |
| 109 | 3-105 | 78 |
| 103 | 6-166 | 85 |
| 105 | 6-166 | 79 |
| 109 | 6-166 | 81 |
+-----+-------+--------+
12 rows in set (0.00 sec)
mysql> # Teachers list
mysql> select *from teacher;
+-----+--------+------+---------------------+-----------+-----------------+
| Tno | Tname | Tsex | Tbirthday | Prof | Depart |
+-----+--------+------+---------------------+-----------+-----------------+
| 804 | Li Cheng | male | 1958-12-02 00:00:00 | associate professor | Department of Computer Science |
| 825 | Wang Ping | Woman | 1972-05-05 00:00:00 | Assistant | Department of Computer Science |
| 831 | Liu Bing | Woman | 1977-08-14 00:00:00 | Assistant | Department of electronic engineering |
| 856 | Zhang Xu | male | 1969-03-12 00:00:00 | lecturer | Department of electronic engineering |
+-----+--------+------+---------------------+-----------+-----------------+
4 rows in set (0.00 sec)Complete according to the above requirements MySQL Statement writing
# Create database sql_exercise01
CREATE DATABASE sql_exercise01;
# Using a database sql_exercise02
USE sql_exercise01;
# Student list
CREATE TABLE student(
`Sno` VARCHAR(20) NOT NULL COMMENT ' Student student id ',
`Sname` VARCHAR(20) NOT NULL COMMENT ' The student's name ',
`Ssex` VARCHAR(20) NOT NULL COMMENT ' Student gender ',
`Sbirthday` DATETIME COMMENT ' Date of birth ',
`Class` VARCHAR(20) COMMENT ' Class number ',
PRIMARY KEY(`Sno`)
)
# Teachers list
CREATE TABLE teacher(
`Tno` VARCHAR(20) NOT NULL COMMENT ' Teacher number ',
`Tname` VARCHAR(20) NOT NULL COMMENT ' Teacher name ',
`Tsex` VARCHAR(20) NOT NULL COMMENT ' Teacher gender ',
`Tbirthday` DATETIME COMMENT ' Date of birth ',
`Prof` VARCHAR(20) COMMENT ' Teacher title ',
`Depart` VARCHAR(20) NOT NULL COMMENT ' achievement ',
PRIMARY KEY(`Tno`)
)
# The curriculum
CREATE TABLE course(
`Cno` VARCHAR(20) NOT NULL COMMENT ' Elective number ',
`Cname` VARCHAR(20) NOT NULL COMMENT ' Course name ',
`Tno` VARCHAR(20) NOT NULL COMMENT ' Teacher number ',
PRIMARY KEY(`Cno`)
)
# Will the Tno In the field key Set to MUL
ALTER TABLE course ADD INDEX(Tno);
# League tables
CREATE TABLE score(
`Sno` VARCHAR(20) NOT NULL COMMENT ' Student student id ',
`Cno` VARCHAR(20) NOT NULL COMMENT ' Elective number ',
`Degree` DECIMAL(10,0) COMMENT ' achievement '
)
# Will the Sno,Cno In the field key Set to MUL
ALTER TABLE score ADD INDEX(Sno);
ALTER TABLE score ADD INDEX(Cno);
# To the students student Table add data
# Use insert Statement to user Add data to the table
# grammar ：insert into Table name ( Field 1, Field 2, Field 3, … )values(' value 1', ' value 2', ' value 3',…);
INSERT INTO student(sno,sname,ssex,sbirthday,class)VALUES(101,' Li Jun ',' male ','1976-02-20','95033');
INSERT INTO student VALUES(103,' Lu Jun ',' male ','1974-06-03','95031');
INSERT INTO student VALUES(105,' Kuang Ming ',' male ','1975-10-02','95031');
INSERT INTO student VALUES(107,' Wang Li ',' Woman ','1976-01-23','95033');
INSERT INTO student VALUES(108,' Zeng Hua ',' male ','1977-09-01','95033');
INSERT INTO student VALUES(109,' Wang Fang ',' Woman ','1975-02-20','95031');
# Information to teachers teacher Table add data
INSERT INTO teacher
VALUES
(804,' Li Cheng ',' male ','1958-12-02',' associate professor ',' Department of Computer Science '),
(856,' Zhang Xu ',' male ','1969-03-12',' lecturer ',' Department of electronic engineering '),
(825,' Wang Ping ',' Woman ','1972-05-05',' Assistant ',' Department of Computer Science '),
(831,' Liu Bing ',' Woman ','1977-08-14',' Assistant ',' Department of electronic engineering ');
# To the course course Table add data
INSERT INTO course
VALUES
('3-105',' Introduction to computer ',825),
('3-245',' operating system ',804),
('6-166',' digital circuit ',856),
('9-888',' Advanced mathematics ',831);
# To the result score Table add data
INSERT INTO score
VALUES
(103,'3-245',86),
(105,'3-245',75),
(109,'3-245',68),
(103,'3-105',92),
(105,'3-105',88),
(109,'3-105',76),
(101,'3-105',64),
(107,'3-105',91),
(108,'3-105',78),
(101,'6-166',85),
(107,'6-166',79),
(108,'6-166',81);
1. Inquire about Student All the records in the table Sname , Ssex and Class Column
SELECT Sname,Ssex,Class FROM Student;
--> final result
mysql> SELECT Sname,Ssex,Class FROM Student;
+-------+------+-------+
| Sname | Ssex | Class |
+-------+------+-------+
| Li Jun | male | 95033 |
| Lu Jun | male | 95031 |
| Kuang Ming | male | 95031 |
| Wang Li | Woman | 95033 |
| Zeng Hua | male | 95033 |
| Wang Fang | Woman | 95031 |
+-------+------+-------+2. Query all the units of the teacher is not repeated Depart Column
SELECT DISTINCT Depart FROM teacher;
--> final result ：
mysql> SELECT DISTINCT Depart FROM teacher;
+------------+
| Depart |
+------------+
| Department of Computer Science |
| Department of electronic engineering |
+------------+3. Inquire about Student All the records of the table
SELECT * FROM Student;
--> final result ：
mysql> SELECT * FROM Student;
+-----+-------+------+---------------------+-------+
| Sno | Sname | Ssex | Sbirthday | Class |
+-----+-------+------+---------------------+-------+
| 101 | Li Jun | male | 1976-02-20 00:00:00 | 95033 |
| 103 | Lu Jun | male | 1974-06-03 00:00:00 | 95031 |
| 105 | Kuang Ming | male | 1975-10-02 00:00:00 | 95031 |
| 107 | Wang Li | Woman | 1976-01-23 00:00:00 | 95033 |
| 108 | Zeng Hua | male | 1977-09-01 00:00:00 | 95033 |
| 109 | Wang Fang | Woman | 1975-02-20 00:00:00 | 95031 |
+-----+-------+------+---------------------+-------+4. Inquire about Score The score in the table is 60 To 80 All records between
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