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MySQL | TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT

Database
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MySQL
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Documentation
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Data types
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Numeric
schedule Jul 1, 2022
Last updated
local_offer MySQL
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tocTable of Contents
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There are a total of 5 integer types offered by MySQL. The following table summarizes them:

Type

Storage (Bytes)

Min Value Signed

Min Value Unsigned

Max Value Signed

Max Value Unsigned

TINYINT

1

-128

0

127

255

SMALLINT

2

-32768

0

32767

65535

MEDIUMINT

3

-8388608

0

8388607

16777215

INT

4

-2147483648

0

2147483647

4294967295

BIGINT

8

0

- $2^{63}$

$2^{63}$ - 1

$2^{64}$ - 1

For an explanation on Signed and Unsigned refer here.

Specifying Length

Note that we can also specify the number of digits that we want to display by using the notation INT(M) where M is the length that you want to display.

NOTE

You should set the length only when you are using the ZEROFILL option as well. Otherwise, specifying the length is pointless.

  • INT(4) ZEROFILL with the stored value of 42 will show 0042

  • INT(4) with the stored value of 42 will show 42

  • INT with the stored value of 32 will show 32

Note that no matter what length you specify, the storage space would still remain the same.

Examples

Consider the following table about some students:

student_id

fname

lname

day_enrolled

age

username

1

Sky

Towner

2015-12-03

17

stowner1

2

Ben

Davis

2016-04-20

19

bdavis2

3

Travis

Apple

2018-08-14

18

tapple3

4

Arthur

David

2016-04-01

16

adavid4

5

Benjamin

Town

2014-01-01

17

btown5

The above sample table can be created using the code here.

To specify the length of column age as INT(5) with ZEROFILL:

ALTER TABLE students MODIFY age INT(5) ZEROFILL;
Query OK, 5 rows affected, 2 warnings (0.03 sec)
Records: 5 Duplicates: 0 Warnings: 2

To check the length for column has been updated:

DESCRIBE students;
+--------------+--------------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------------------+------+-----+---------+----------------+
| student_id | int unsigned | NO | PRI | NULL | auto_increment |
| fname | varchar(30) | YES | | NULL | |
| lname | varchar(30) | YES | | NULL | |
| day_enrolled | date | YES | | NULL | |
| age | int(5) unsigned zerofill | YES | | NULL | |
| username | varchar(15) | YES | | NULL | |
+--------------+--------------------------+------+-----+---------+----------------+

To check how age is displayed in students table now:

SELECT * FROM students;
+------------+----------+--------+--------------+-------+----------+
| student_id | fname | lname | day_enrolled | age | username |
+------------+----------+--------+--------------+-------+----------+
| 1 | Sky | Towner | 2015-12-03 | 00017 | stowner1 |
| 2 | Ben | Davis | 2016-04-20 | 00019 | bdavis2 |
| 3 | Travis | Apple | 2018-08-14 | 00018 | tapple3 |
| 4 | Arthur | David | 2016-04-01 | 00016 | adavid4 |
| 5 | Benjamin | Town | 2014-01-01 | 00017 | btown5 |
+------------+----------+--------+--------------+-------+----------+

Note that age values are now left-padded with zeros to 5 digits.

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Published by Arthur Yanagisawa
Edited by 0 others
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