Table Index MySQL

mysql>
mysql>
mysql> CREATE TABLE PLAYERS
    -> (
    ->     PLAYERNO INTEGER NOT NULL,
    ->     NAME CHAR(15) NOT NULL,
    ->     INITIALS CHAR(3) NOT NULL,
    ->     BIRTH_DATE DATE ,
    ->     SEX CHAR(1) NOT NULL,
    ->     JOINED SMALLINT NOT NULL,
    ->     STREET VARCHAR(30) NOT NULL,
    ->     HOUSENO CHAR(4) ,
    ->     POSTCODE CHAR(6) ,
    ->     TOWN VARCHAR(30) NOT NULL,
    ->     PHONENO CHAR(13) ,
    ->     LEAGUENO CHAR(4) ,
    ->     PRIMARY KEY (PLAYERNO)
    -> );
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
mysql> SHOW COLUMNS FROM PLAYERS;
+------------+-------------+------+-----+---------+-------+
| Field      | Type        | Null | Key | Default | Extra |
+------------+-------------+------+-----+---------+-------+
| PLAYERNO   | int(11)     | NO   | PRI | NULL    |       |
| NAME       | char(15)    | NO   |     | NULL    |       |
| INITIALS   | char(3)     | NO   |     | NULL    |       |
| BIRTH_DATE | date        | YES  |     | NULL    |       |
| SEX        | char(1)     | NO   |     | NULL    |       |
| JOINED     | smallint(6) | NO   |     | NULL    |       |
| STREET     | varchar(30) | NO   |     | NULL    |       |
| HOUSENO    | char(4)     | YES  |     | NULL    |       |
| POSTCODE   | char(6)     | YES  |     | NULL    |       |
| TOWN       | varchar(30) | NO   |     | NULL    |       |
| PHONENO    | char(13)    | YES  |     | NULL    |       |
| LEAGUENO   | char(4)     | YES  |     | NULL    |       |
+------------+-------------+------+-----+---------+-------+
12 rows in set (0.00 sec)
mysql>
mysql> drop table players;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
mysql>