Syntax
------

SMALLINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]

Description
-----------

A small integer. The signed range is -32768 to 32767. The unsigned range is 0
to 65535.

If a column has been set to ZEROFILL, all values will be prepended by zeros so
that the SMALLINT value contains a number of M digits.

Note: If the ZEROFILL attribute has been specified, the column will
automatically become UNSIGNED.

INT2 is a synonym for SMALLINT.

For more details on the attributes, see Numeric Data Type Overview.

Examples
--------

CREATE TABLE smallints (a SMALLINT,b SMALLINT UNSIGNED,c SMALLINT ZEROFILL);

With strict_mode set, the default from MariaDB 10.2.4:

INSERT INTO smallints VALUES (-10,-10,-10);
ERROR 1264 (22003): Out of range value for column 'b' at row 1

INSERT INTO smallints VALUES (-10,10,-10);
ERROR 1264 (22003): Out of range value for column 'c' at row 1

INSERT INTO smallints VALUES (-10,10,10);

INSERT INTO smallints VALUES (32768,32768,32768);
ERROR 1264 (22003): Out of range value for column 'a' at row 1

INSERT INTO smallints VALUES (32767,32768,32768);

SELECT * FROM smallints;
+-------+-------+-------+
| a     | b     | c     |
+-------+-------+-------+
|   -10 |    10 | 00010 |
| 32767 | 32768 | 32768 |
+-------+-------+-------+

With strict_mode unset, the default until MariaDB 10.2.3:

INSERT INTO smallints VALUES (-10,-10,-10);
Query OK, 1 row affected, 2 warnings (0.09 sec)
Warning (Code 1264): Out of range value for column 'b' at row 1
Warning (Code 1264): Out of range value for column 'c' at row 1

INSERT INTO smallints VALUES (-10,10,-10);
Query OK, 1 row affected, 1 warning (0.08 sec)
Warning (Code 1264): Out of range value for column 'c' at row 1

INSERT INTO smallints VALUES (-10,10,10);

INSERT INTO smallints VALUES (32768,32768,32768);
Query OK, 1 row affected, 1 warning (0.04 sec)
Warning (Code 1264): Out of range value for column 'a' at row 1

INSERT INTO smallints VALUES (32767,32768,32768);

SELECT * FROM smallints;
+-------+-------+-------+
| a     | b     | c     |
+-------+-------+-------+
|   -10 |     0 | 00000 |
|   -10 |    10 | 00000 |
|   -10 |    10 | 00010 |
| 32767 | 32768 | 32768 |
| 32767 | 32768 | 32768 |
+-------+-------+-------+

URL: https://mariadb.com/kb/en/smallint/