Type
|
Use for
|
Size
|
TINYINT
|
A very small integer
|
The signed range is –128
to 127. The unsigned range is 0 to 255.
|
SMALLINT
|
A small integer
|
The signed range is –32768
to 32767. The unsigned range is 0 to 65535
|
MEDIUMINT
|
A medium-size integer
|
The signed range is –8388608
to 8388607. The unsigned range is 0 to 16777215
|
INT or INTEGER
|
A normal-size integer
|
The signed range is –2147483648
to 2147483647. The unsigned range is 0 to 4294967295
|
BIGINT
|
A large integer
|
The signed range is –9223372036854775808
to 9223372036854775807. The unsigned range is 0 to
18446744073709551615
|
FLOAT
|
A small
(single-precision) floating-point number. Cannot be
unsigned
|
Ranges are –3.402823466E+38
to –1.175494351E-38,
0 and 1.175494351E-38 to 3.402823466E+38. If the
number of Decimals is not set or <= 24 it is a
single-precision floating point number
|
DOUBLE,
DOUBLE PRECISION,
REAL
|
A normal-size
(double-precision) floating-point number. Cannot be
unsigned
|
Ranges are
-1.7976931348623157E+308 to -2.2250738585072014E-308,
0 and 2.2250738585072014E-308 to
1.7976931348623157E+308. If the number of Decimals is
not set or 25 <= Decimals <= 53 stands for a
double-precision floating point number
|
DECIMAL,
NUMERIC
|
An unpacked
floating-point number. Cannot be unsigned
|
Behaves like a CHAR
column: “unpacked”
means the number is stored as a string, using one
character for each digit of the value. The decimal
point, and, for negative numbers, the ‘-‘
sign is not counted in Length. If Decimals is 0,
values will have no decimal point or fractional part.
The maximum range of DECIMAL values is the same as for
DOUBLE, but the actual range for a given DECIMAL
column may be constrained by the choice of Length and
Decimals. If Decimals is left out it’s
set to 0. If Length is left out it’s
set to 10. Note that in MySQL 3.22 the Length includes
the sign and the decimal point
|
DATE
|
A date
|
The supported range is ‘1000-01-01’
to ‘9999-12-31’.
MySQL displays DATE values in ‘YYYY-MM-DD’
format
|
DATETIME
|
A date and time
combination
|
The supported range is ‘1000-01-01
00:00:00’
to ‘9999-12-31
23:59:59’.
MySQL displays DATETIME values in ‘YYYY-MM-DD
HH:MM:SS’
format
|
TIMESTAMP
|
A timestamp
|
The range is ‘1970-01-01
00:00:00’
to sometime in the year 2037. MySQL displays TIMESTAMP
values in YYYYMMDDHHMMSS, YYMMDDHHMMSS, YYYYMMDD or
YYMMDD format, depending on whether M is 14 (or
missing), 12, 8 or 6, but allows you to assign values
to TIMESTAMP columns using either strings or numbers.
A TIMESTAMP column is useful for recording the date
and time of an INSERT or UPDATE operation because it
is automatically set to the date and time of the most
recent operation if you don’t
give it a value yourself
|
TIME
|
A time
|
The range is ‘-838:59:59’
to ‘838:59:59’.
MySQL displays TIME values in ‘HH:MM:SS’
format, but allows you to assign values to TIME
columns using either strings or numbers
|
YEAR
|
A year in 2- or 4- digit
formats (default is 4-digit)
|
The allowable values are
1901 to 2155, and 0000 in the 4 year format and
1970-2069 if you use the 2 digit format (70-69). MySQL
displays YEAR values in YYYY format, but allows you to
assign values to YEAR columns using either strings or
numbers. (The YEAR type is new in MySQL 3.22.)
|
CHAR
|
A fixed-length string
that is always right-padded with spaces to the
specified length when stored
|
The range of Length is 1
to 255 characters. Trailing spaces are removed when
the value is retrieved. CHAR values are sorted and
compared in case-insensitive fashion according to the
default character set unless the BINARY keyword is
given
|
VARCHAR
|
A variable-length
string. Note: Trailing spaces are removed when the
value is stored (this differs from the ANSI SQL
specification)
|
The range of Length is 1
to 255 characters. VARCHAR values are sorted and
compared in case-insensitive fashion unless the BINARY
keyword is given
|
TINYBLOB,
TINYTEXT
|
|
A BLOB or TEXT column
with a maximum length of 255 (2^8 - 1) characters
|
BLOB,
TEXT
|
|
A BLOB or TEXT column
with a maximum length of 65535 (2^16 - 1) characters
|
MEDIUMBLOB,
MEDIUMTEXT
|
|
A BLOB or TEXT column
with a maximum length of 16777215 (2^24 - 1)
characters
|
LONGBLOB,
LONGTEXT
|
|
A BLOB or TEXT column
with a maximum length of 4294967295 (2^32 - 1)
characters
|
ENUM
|
An enumeration
|
A string object that can
have only one value, chosen from the list of values ‘value1’,
‘value2’,
..., or NULL. An ENUM can have a maximum of 65535
distinct values.
|
SET
|
A set
|
A string object that can
have zero or more values, each of which must be chosen
from the list of values ‘value1’,
‘value2’,
... A SET can have a maximum of 64 members
|
