Linux-6-作业练习

1. 通过编译、二进制安装MySQL5.7

请移步：https://www.cnblogs.com/lyj1023/p/16252556.html
2. 二进制安装mariadb10.4

请移步：https://www.cnblogs.com/lyj1023/p/16262486.html
3. 导入hellodb.sql生成数据库

[root@centos8-liyj ~]#mysql -uroot -patech123456
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 21
Server version: 10.4.24-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases
    -> ;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.000 sec)

MariaDB [(none)]> source /root/hellodb_innodb.sql

MariaDB [hellodb]> show databases;
+--------------------+
| Database           |
+--------------------+
| hellodb            |
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.000 sec)

MariaDB [hellodb]> use hellodb 
Database changed
MariaDB [hellodb]> show tables;
+-------------------+
| Tables_in_hellodb |
+-------------------+
| classes           |
| coc               |
| courses           |
| scores            |
| students          |
| teachers          |
| toc               |
+-------------------+
7 rows in set (0.000 sec)

(1) 在students表中，查询年龄大于25岁，且为男性的同学的名字和年龄

MariaDB [hellodb]> select Name,Age,Gender from students 
    -> ;
+---------------+-----+--------+
| Name          | Age | Gender |
+---------------+-----+--------+
| Shi Zhongyu   |  22 | M      |
| Shi Potian    |  22 | M      |
| Xie Yanke     |  53 | M      |
| Ding Dian     |  32 | M      |
| Yu Yutong     |  26 | M      |
| Shi Qing      |  46 | M      |
| Xi Ren        |  19 | F      |
| Lin Daiyu     |  17 | F      |
| Ren Yingying  |  20 | F      |
| Yue Lingshan  |  19 | F      |
| Yuan Chengzhi |  23 | M      |
| Wen Qingqing  |  19 | F      |
| Tian Boguang  |  33 | M      |
| Lu Wushuang   |  17 | F      |
| Duan Yu       |  19 | M      |
| Xu Zhu        |  21 | M      |
| Lin Chong     |  25 | M      |
| Hua Rong      |  23 | M      |
| Xue Baochai   |  18 | F      |
| Diao Chan     |  19 | F      |
| Huang Yueying |  22 | F      |
| Xiao Qiao     |  20 | F      |
| Ma Chao       |  23 | M      |
| Xu Xian       |  27 | M      |
| Sun Dasheng   | 100 | M      |
+---------------+-----+--------+
25 rows in set (0.000 sec)

MariaDB [hellodb]> select Name,Age,Gender from students where Age>=25 and Gender='M';
+--------------+-----+--------+
| Name         | Age | Gender |
+--------------+-----+--------+
| Xie Yanke    |  53 | M      |
| Ding Dian    |  32 | M      |
| Yu Yutong    |  26 | M      |
| Shi Qing     |  46 | M      |
| Tian Boguang |  33 | M      |
| Lin Chong    |  25 | M      |
| Xu Xian      |  27 | M      |
| Sun Dasheng  | 100 | M      |
+--------------+-----+--------+
8 rows in set (0.000 sec)

(2) 以ClassID为分组依据，显示每组的平均年龄

MariaDB [hellodb]> select ClassID, avg(Age) 平均年龄 from students group by ClassID;
+---------+--------------+
| ClassID | 平均年龄     |
+---------+--------------+
|    NULL |      63.5000 |
|       1 |      20.5000 |
|       2 |      36.0000 |
|       3 |      20.2500 |
|       4 |      24.7500 |
|       5 |      46.0000 |
|       6 |      20.7500 |
|       7 |      19.6667 |
+---------+--------------+
8 rows in set (0.001 sec)

(3) 显示第2题中平均年龄大于30的分组及平均年龄

MariaDB [hellodb]> select ClassID, avg(Age)  from students group by ClassID  having avg(Age)>=30;
+---------+----------+
| ClassID | avg(Age) |
+---------+----------+
|    NULL |  63.5000 |
|       2 |  36.0000 |
|       5 |  46.0000 |
+---------+----------+
3 rows in set (0.001 sec)

(4) 显示以L开头的名字的同学的信息

MariaDB [hellodb]> select * from students where  Name like 'L%';
+-------+-------------+-----+--------+---------+-----------+
| StuID | Name        | Age | Gender | ClassID | TeacherID |
+-------+-------------+-----+--------+---------+-----------+
|     8 | Lin Daiyu   |  17 | F      |       7 |      NULL |
|    14 | Lu Wushuang |  17 | F      |       3 |      NULL |
|    17 | Lin Chong   |  25 | M      |       4 |      NULL |
+-------+-------------+-----+--------+---------+-----------+
3 rows in set (0.001 sec)

4.数据库授权magedu用户，允许192.168.1.0/24网段可以连接mysql

MariaDB [hellodb]> create user magedu@'192.168.1.%/255.255.255.0' identified by 'atech123456';
Query OK, 0 rows affected (0.002 sec)

5.主从复制及主主复制的实现

主从复制https://www.cnblogs.com/lyj1023/p/16270642.html

主主复制https://www.cnblogs.com/lyj1023/p/16270856.html
6.xtrabackup实现全量+增量+binlog恢复库

https://www.cnblogs.com/lyj1023/p/16271860.html
7.MyCAT实现MySQL读写分离

 https://www.cnblogs.com/lyj1023/p/16274014.html