Using the SET type : Set « Data Types « MySQL Tutorial

1. MySQL Tutorial
2. Data Types
3. Set

mysql>
mysql> CREATE TABLE myset (col SET('a', 'b', 'c', 'd'));
Query OK, 0 rows affected (0.05 sec)

mysql> INSERT INTO myset (col) VALUES ('a,d'),
    ->                                ('d,a'),
    ->                                ('a,d,a'),
    ->                                ('a,d,d'),
    ->                                ('d,a,d');
Query OK, 5 rows affected (0.00 sec)
Records: 5  Duplicates: 0  Warnings: 0

mysql> SELECT col FROM myset;
+------+
| col  |
+------+
| a,d  |
| a,d  |
| a,d  |
| a,d  |
| a,d  |
+------+
5 rows in set (0.00 sec)

mysql>
mysql> drop table myset;
Query OK, 0 rows affected (0.00 sec)

mysql>