mysql> show create database usersystem;
+------------+---------------------------------------------------------------------+
| Database   | Create Database                                                     |
+------------+---------------------------------------------------------------------+
| usersystem | CREATE DATABASE `usersystem` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+------------+---------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> show create table user;
ERROR 1046 (3D000): No database selected
mysql> use usersystem;
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
mysql> show create table user;
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                                                                                                                                                                                                    |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| user  | CREATE TABLE `user` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `first_name` varchar(16) DEFAULT NULL,
  `last_name` varchar(16) DEFAULT NULL,
  `email` varchar(64) DEFAULT NULL,
  `inserted_at` datetime NOT NULL,
  `updated_at` datetime NOT NULL,
  `username` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `id` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)