The amount of storage required for column type
Tinyint 1 byte
Smallint 2 bytes
Mediumint 3 bytes
INT 4 bytes
Integer 4 bytes
Bigint 8 bytes
Float (x) 4 If x <= 24 or 8 if 25 <= x <= 53
Float 4 bytes
Double 8 bytes
Double precision 8 bytes
REAL 8 bytes
DECIMAL (M, D) M bytes (D 2, if m Numeric (M, D) M bytes (D 2, if m Date and time type The amount of storage required for column type Date 3 bytes Datetime 8 bytes Timestamp 4 bytes Time 3 bytes Year 1 byte String type The amount of storage required for column type Char (m) M bytes, 1 <= m <= 255 VARCHAR (M) L 1 bytes, where l <= m and 1 <= m <= 255 Tinyblob, Tinytext L 1 byte, L <2 ^ 8 BLOB, Text L 2 bytes, here L <2 ^ 16 Mediumblob, MediumText L 3 bytes, here L <2 ^ 24 Longblob, Longtext L 4 bytes, here L <2 ^ 32 Enum ('Value1', 'Value2', ...) 1 or 2 bytes depends on the number of enumerated values (maximum value 65535) Set ('Value1', 'Value2', ...) 1, 2, 3, 4 or 8 bytes depends on the number of collections (up to 64 members)
