一、mysql -V

[root@htlwk0001host ~]# mysql -V
mysql  Ver 14.14 Distrib 5.7.31, for Linux (x86_64) using  EditLine wrapper

注意：V 是大写

二、登录数据库后会显示版本信息

[root@htlwk0001host ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 702
Server version: 5.7.31 MySQL Community Server (GPL)Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.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.

如上所示 Server version: 5.7.31 MySQL Community Server (GPL) 这就是数据库的版本信息

三、mysqladmin -uroot -p version

[root@htlwk0001host /]# mysqladmin -uroot -p version
Enter password: 
mysqladmin  Ver 8.42 Distrib 5.7.31, for Linux on x86_64
Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Server version		5.7.31
Protocol version	10
Connection		Localhost via UNIX socket
UNIX socket		/var/lib/mysql/mysql.sock
Uptime:			1 day 5 hours 41 min 13 secThreads: 21  Questions: 12030  Slow queries: 0  Opens: 114  Flush tables: 1  Open tables: 107  Queries per second avg: 0.112

四、select version()

查询数据库的版本号

mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.31    |
+-----------+
1 row in set (0.00 sec)

五、命令 status

mysql> status
--------------
mysql  Ver 14.14 Distrib 5.7.31, for Linux (x86_64) using  EditLine wrapperConnection id:		1243
Current database:	
Current user:		root@localhost
SSL:			Not in use
Current pager:		stdout
Using outfile:		''
Using delimiter:	;
Server version:		5.7.31 MySQL Community Server (GPL)
Protocol version:	10
Connection:		Localhost via UNIX socket
Server characterset:	utf8mb4
Db     characterset:	utf8mb4
Client characterset:	utf8mb4
Conn.  characterset:	utf8mb4
UNIX socket:		/var/lib/mysql/mysql.sock
Uptime:			1 day 6 hours 16 min 37 secThreads: 21  Questions: 12273  Slow queries: 0  Opens: 114  Flush tables: 1  Open tables: 107  Queries per second avg: 0.112
--------------

六、show variables like ‘%version%’

mysql> show variables like '%version%';
+-------------------------+------------------------------+
| Variable_name           | Value                        |
+-------------------------+------------------------------+
| innodb_version          | 5.7.31                       |
| protocol_version        | 10                           |
| slave_type_conversions  |                              |
| tls_version             | TLSv1,TLSv1.1,TLSv1.2        |
| version                 | 5.7.31                       |
| version_comment         | MySQL Community Server (GPL) |
| version_compile_machine | x86_64                       |
| version_compile_os      | Linux                        |
+-------------------------+------------------------------+
8 rows in set (0.00 sec)