Numeric Types
| |
Signed |
Unsigned |
Storage |
TINYINT |
127 |
255 |
1 byte |
SMALLINT |
32K |
65K |
2 bytes |
MEDIUMINT |
8M |
16M |
3 bytes |
INT |
231 |
232 |
4 bytes |
BIGINT |
263-1 |
264-1 |
8 bytes |
FLOAT |
|
|
4 bytes |
DOUBLE |
|
|
8 bytes |
224 = 16M
231 = 2B
232 = 4B
Date and Time Types
YEAR |
1 byte |
DATE |
3 bytes |
TIME |
3 bytes + fractional seconds storage |
DATETIME |
5 bytes + fractional seconds storage |
TIMESTAMP |
4 bytes + fractional seconds storage |
|
|
NOTE ON CHARSET
To calculate the number of bytes used to store a particular CHAR, VARCHAR, or TEXT column value, you must take into account the character set used for that column and whether the value contains multibyte characters. In particular, when using a utf8 Unicode character set, you must keep in mind that not all characters use the same number of bytes. utf8mb3 and utf8mb4 character sets can require up to three and four bytes per character, respectively.
All columns share a maximum row size of 65,535 bytes, excluding BLOB and TEXT columns. |
String Types
|
|
|
|
|
|
| |
M
+ 2 bytes, more than 255 (65KB) |
TINYBLOB |
L
+ 1 bytes, where L
< 2 8 |
TINYTEXT |
L
+ 1 bytes, where L
< 2 8 (256B) |
TEXT |
L
+ 2 bytes, where L
< 2 16 (65KB) |
BLOB |
L
+ 2 bytes, where L
< 2 16 |
MEDIUMTEXT |
L
+ 3 bytes, where L
< 2 24 (16MB) |
MEDIUMBLOB |
L
+ 3 bytes, where L
< 2 24 |
LONGTEXT |
L
+ 4 bytes, where L
< 2 32 (4GB) |
LONGBLOB |
L
+ 4 bytes, where L
< 2 32 |
JSON |
L
+ 4 bytes, where L
< 2 32 |
ENUM |
1 or 2 bytes (65K max values) |
SET |
1, 2, 3, 4, or 8 bytes (64 max values) |
28 = 256
216 = 65K
224 = 16M
232 = 4B
|
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