MySQL size and length of each data type

Source: Internet
Author: User

Digital type

Type Size Range (signed) Range (unsigned) Use
TINYINT 1 bytes (-128,127) (0,255) Small integer value
SMALLINT 2 bytes (-32 768,32 767) (0,65 535) Large integer value
Mediumint 3 bytes (-8 388 608,8 388 607) (0,16 777 215) Large integer value
int or integer 4 bytes (-2 147 483 648,2 147 483 647) (0,4 294 967 295) Large integer value
BIGINT 8 bytes (-9 233 372 036 854 775 808,9 223 372 036 854 775 807) (0,18 446 744 073 709 551 615) Maximum integer value
FLOAT 4 bytes ( -3.402 823 466 e+38,1.175 494 351 E-38), 0, (1.175 494 351 e-38,3.402 823 466 351 e+38) 0, (1.175 494 351 e-38,3.402 823 466 e+38) Single precision
Floating point value
DOUBLE 8 bytes (1.797 693 134 862 315 7 e+308,2.225 073 858 507 201 4 E-308), 0, (2.225 073 858 507 201 4 e-308,1.797 693 134 862 315 7 e+3 08) 0, (2.225 073 858 507 201 4 e-308,1.797 693 134 862 315 7 e+308) Double precision
Floating point value
DECIMAL For decimal (m,d), if m>d, is m+2 otherwise d+2 Values that depend on M and D Values that depend on M and D Decimal value


Character type

CHAR 0-255 bytes Fixed length string
VARCHAR 0-255 bytes Variable length string
Tinyblob 0-255 bytes A binary string of no more than 255 characters
Tinytext 0-255 bytes Short text string
Blob 0-65 535 bytes Long text data in binary form
TEXT 0-65 535 bytes Long Text data
Mediumblob 0-16 777 215 bytes Medium-length text data in binary form
Mediumtext 0-16 777 215 bytes Medium-Length text data
Logngblob 0-4 294 967 295 bytes Large text data in binary form
Longtext 0-4 294 967 295 bytes Maximum text data

Enumerate collections

ENUM (maximum of 65,535 members) 64KB
SET (maximum of 64 members) 64KB

Time Type

Type Size
bytes
Range Format Use
DATE 3 1000-01-01/9999-12-31 Yyyy-mm-dd Date value
Time 3 ' -838:59:59 '/' 838:59:59 ' HH:MM:SS Time Value or duration
Year 1 1901/2155 YYYY Year value
Datetime 8 1000-01-01 00:00:00/9999-12-31 23:59:59 YYYY-MM-DD HH:MM:SS Blend date and time values
TIMESTAMP 8 1970-01-01 00:00:00/2037, sometime YYYYMMDD HHMMSS Mixed date and time values, timestamp

MySQL size and length of each data type

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