步骤1 - 连接到MySQL数据库服务器：
[root@host]# mysql -u root -p
Enter password:******
提示登陆成功
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 215827
Server version: 5.7.25-log Source distribution
Copyright (c) 2000, 2019, 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.
退出数据库
mysql> exit
步骤2 -切换到ytkah数据库（进入到具体的数据库）：
mysql> USE ytkah;
Database changed
表示进入到ytkah这个数据库
步骤3 - 显示ytkah数据库中的所有表：
mysql> SHOW TABLES;
+---------------------------+
| Tables_in_ytkah |
+---------------------------+
| wp_commentmeta |
| wp_comments |
| wp_links |
| wp_options |
| wp_postmeta |
| wp_posts |
| wp_term_relationships |
| wp_term_taxonomy |
| wp_termmeta |
| wp_terms |
| wp_usermeta |
| wp_users |
+---------------------------+
14 rows in set (0.00 sec)
显示ytkah数据库中包含字符的所有表：
①显示数据库中以wp_user开头的所有表
mysql> show tables like 'wp_user%';
+--------------------------------------+
| Tables_in_ytkah (wp_user%) |
+--------------------------------------+
| wp_usermeta |
| wp_users |
+--------------------------------------+
2 rows in set (0.00 sec)
②显示数据库中以users结尾的所有表
mysql> show tables like '%users';
+------------------------------------+
| Tables_in_ytkah (%users) |
+------------------------------------+
| wp_users |
+------------------------------------+
1 row in set (0.00 sec)
③显示数据库中包含user的所有表
mysql> show tables like '%user%';
+------------------------------------+
| Tables_in_ytkah (%user%) |
+------------------------------------+
| wp_usermeta |
| wp_users |
+------------------------------------+
2 rows in set (0.00 sec)
