mysql> CREATE TABLE IF NOT EXISTS testNUM(
    -> -- 預設為有符號
    -> num1 TINYINT,
    -> num2 TINYINT UNSIGNED,
    -> num3 INT,
    -> num4 INT ZEROFILL,
    -> num5 INT UNSIGNED ZEROFILL
    -> );
Query OK, 0 rows affected (0.08 sec)

mysql> INSERT testNUM(num1,num2) VALUES(-5,-5);
ERROR 1264 (22003): Out of range value for column 'num2' at row 1
mysql> INSERT testNUM(num3,num4) VALUES(123,123);
mysql> INSERT testNUM VALUES(0,0,0,0,0);
mysql> INSERT testNUM(num3,num4,num5) VALUES(123,123,123);

mysql> SELECT * FROM testNUM;
+------+------+------+------------+------------+
| num1 | num2 | num3 | num4       | num5       |
+------+------+------+------------+------------+
| NULL | NULL |  123 | 0000000123 |       NULL |
|    0 |    0 |    0 | 0000000000 | 0000000000 |
| NULL | NULL |  123 | 0000000123 | 0000000123 |
+------+------+------+------------+------------+