A small integer.
The signed range is -32768 to 32767.
The unsigned range is 0 to 65535.
mysql>
mysql> CREATE TABLE myTable
-> (
-> ID SMALLINT(4) UNSIGNED ZEROFILL,
-> Quantity INT UNSIGNED
-> );
Query OK, 0 rows affected (0.05 sec)
mysql>
mysql> desc myTable;
+----------+-------------------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------------------------+------+-----+---------+-------+
| ID | smallint(4) unsigned zerofill | YES | | NULL | |
| Quantity | int(10) unsigned | YES | | NULL | |
+----------+-------------------------------+------+-----+---------+-------+
2 rows in set (0.02 sec)
mysql>
mysql> drop table myTable;
Query OK, 0 rows affected (0.00 sec)