learning mysql database

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mysql> create database student_db;
Query OK, 1 row affected (0.55 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| student_db         |
| sys                |
| wpress             |
+--------------------+
6 rows in set (0.31 sec)

mysql> use student_db;
Database changed
mysql> show tables;
Empty set (0.38 sec)

mysql> create table students
    -> (
    -> student_id char(5) primary key,
    -> first_name varchar(25) not null,
    -> last_name varchar(25) not null,
    -> gender varchar(6) not null,
    -> mobile_no char(11),
    -> email_id varchar(50)
    -> );
Query OK, 0 rows affected (0.62 sec)

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

mysql> describe students;
+------------+-------------+------+-----+---------+-------+
| Field      | Type        | Null | Key | Default | Extra |
+------------+-------------+------+-----+---------+-------+
| student_id | char(5)     | NO   | PRI | NULL    |       |
| first_name | varchar(25) | NO   |     | NULL    |       |
| last_name  | varchar(25) | NO   |     | NULL    |       |
| gender     | varchar(6)  | NO   |     | NULL    |       |
| mobile_no  | char(11)    | YES  |     | NULL    |       |
| email_id   | varchar(50) | YES  |     | NULL    |       |
+------------+-------------+------+-----+---------+-------+
6 rows in set (0.18 sec)

mysql>