mysql查看版本

四种方式：

1. 命令行

------------------->$ mysql -V
mysql  Ver 14.14 Distrib 5.7.17, for Linux (x86_64) using  EditLine wrapper

2. mysql的函数

mysql> select version();
+-------------------------+
| version()               |
+-------------------------+
| 5.7.17-0ubuntu0.16.04.1 |
+-------------------------+
1 row in set (0.00 sec)

3. 查看状态

mysql> status;
--------------
mysql  Ver 14.14 Distrib 5.7.17, for Linux (x86_64) using  EditLine wrapper

Connection id:        6
Current database:    test

4. 使用help

------------------->$ mysql --help 
mysql  Ver 14.14 Distrib 5.7.17, for Linux (x86_64) using  EditLine wrapper
Copyright (c) 2000, 2016, 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.

Usage: mysql [OPTIONS] [database]
  -?, --help          Display this help and exit.
  -I, --help          Synonym for -?