:~# mysql -u root -p
Enter password:
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Your MySQL connection id is 3
Server version: 5.7.27-0ubuntu0.16.04.1 (Ubuntu)

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mysql>
mysql> ls
->
->
->
-> ^C^C^C
mysql>
mysql>
mysql>
mysql>
mysql>
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| django |
| mysql |
| performance_schema |
| sys |
+--------------------+
5 rows in set (0.00 sec)

mysql>
mysql>
mysql> use django;
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>
mysql> show tables;
+------------------+
| Tables_in_django |
+------------------+
| ranking |
+------------------+
1 row in set (0.00 sec)

mysql>
mysql> use table ranking;
ERROR 1049 (42000): Unknown database 'table'
mysql> use ranking;
ERROR 1049 (42000): Unknown database 'ranking'
mysql> alter table ranking add hash varchar(50);
Query OK, 0 rows affected (0.03 sec)
Records: 0 Duplicates: 0 Warnings: 0

mysql>
mysql>
mysql>
mysql> show tables;
+------------------+
| Tables_in_django |
+------------------+
| ranking |
+------------------+
1 row in set (0.00 sec)

mysql> show columns from ranking;
+----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| username | varchar(100) | NO | | NULL | |
| mark | int(11) | NO | | NULL | |
| hash | varchar(50) | YES | | NULL | |
+----------+--------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)

mysql>
mysql>
mysql>
mysql> show columns from ranking;