当前位置：网站首页>Basic operation of MySQL database: import hellodb SQL and query as required; Create account and authorize
Basic operation of MySQL database: import hellodb SQL and query as required; Create account and authorize
2022-06-28 23:34:00 【njsummer】
1. Import hellodb.sql Generate database
# This time CentOS8.5 Operating system and MySQL5.7.36 The complete
mysql> select version();
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| version() |
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|
5.7.36-log |
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1 row
in
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[[email protected] ]
#mysql -uroot -ps*****2
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is
8
Server version:
5.7.36-log Source distribution
Copyright (c)
2000,
2021, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type
'help;' or
'\h'
for help. Type
'\c' to
clear the current input statement.
mysql> show tables;
ERROR
1046 (3D000): No database selected
mysql> show databases;
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| Database |
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| information_schema |
| mysql |
| mytestdb1 |
| performance_schema |
| sys |
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5 rows
in
set (0.06 sec)
mysql> quit
# Import database and verify
[[email protected] ]
#mysql -uroot -ps*****2 < /data/hellodb_innodb.sql
mysql: [Warning] Using a password on the command line interface can be insecure.
[[email protected] ]
#mysql -uroot -ps*****2
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is
10
Server version:
5.7.36-log Source distribution
Copyright (c)
2000,
2021, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type
'help;' or
'\h'
for help. Type
'\c' to
clear the current input statement.
mysql> show databases;
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| Database |
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--
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| information_schema |
| hellodb |
| mysql |
| mytestdb1 |
| performance_schema |
| sys |
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1.1 stay students In the table , Query age is greater than 25 year , And the name and age of the male students
# Get into hellodb database
mysql> use hellodb
Reading table information
for completion of table and column names
You can turn off this feature to
get a quicker startup with
-A
Database changed
# stay students In the table , Query age is greater than 25 year , And the name and age of the male students
mysql> select name,age from students where
gender
=
'M' and age>25;
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| name | age |
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| Xie Yanke |
53 |
| Ding Dian |
32 |
| Yu Yutong |
26 |
| Shi Qing |
46 |
| Tian Boguang |
33 |
| Xu Xian |
27 |
| Sun Dasheng |
100 |
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1.2 With ClassID To group by , Show the average age of each group
mysql> select classid,avg(age) from students group by classid;
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| classid | avg(age) |
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| NULL |
63.5000 |
|
1 |
20.5000 |
|
2 |
36.0000 |
|
3 |
20.2500 |
|
4 |
24.7500 |
|
5 |
46.0000 |
|
6 |
20.7500 |
|
7 |
19.6667 |
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8 rows
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1.3 According to the first 2 The average age in the questions is greater than 30 And the average age
mysql> select classid,avg(age) from students group by classid having avg(age)>30;
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| classid | avg(age) |
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| NULL |
63.5000 |
|
2 |
36.0000 |
|
5 |
46.0000 |
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1.4 Display with L Information about the students with the first name
mysql> select * from students where name like
'L%';
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| StuID | Name | Age | Gender | ClassID | TeacherID |
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|
8 | Lin Daiyu |
17 | F |
7 | NULL |
|
14 | Lu Wushuang |
17 | F |
3 | NULL |
|
17 | Lin Chong |
25 | M |
4 | NULL |
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3 rows
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2. Database authorization magedu user , allow 192.168.1.0/24 Segments can be connected mysql
# Create user
mysql> create user
'magedu'@
'192.168.1.%' identified by
'centos';
Query OK,
0 rows affected (0.06 sec)
mysql> show grants
for [email protected]
'192.168.1.%';
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| Grants
for [email protected]% |
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| GRANT USAGE ON *.* TO
'magedu'@
'192.168.1.%' |
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1 row
in
set (0.00 sec)
# to grant authorization
mysql> grant all on *.* to [email protected]
'192.168.1.%' identified by
'centos';
Query OK,
0 rows affected,
1 warning (0.01 sec)
mysql> show grants
for [email protected]
'192.168.1.%';
+
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| Grants
for [email protected]% |
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| GRANT ALL PRIVILEGES ON *.* TO
'magedu'@
'192.168.1.%' |
+
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1 row
in
set (0.00 sec)
mysql>
# Query all accounts in the database
mysql> SELECT DISTINCT CONCAT(
'User: '
'',user,
''
'@'
'',host,
''
';') AS query FROM mysql.user;
+
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| query |
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| User:
'shone'@
'%'; |
| User:
'magedu'@
'192.168.1.%'; |
| User:
'summer'@
'192.168.1.%'; |
| User:
'mysql.session'@
'localhost'; |
| User:
'mysql.sys'@
'localhost'; |
| User:
'root'@
'localhost'; |
+
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set (0.02 sec)
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