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Web Global Net Web Application & Web Development Project Center  |  Technical Issues  |  MySQL  |  Topic: MySQL Field Types 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: MySQL Field Types  (Read 9763 times)
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« on: September 20, 2007, 04:52: PM »


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 its set to 0. If Length is left out its 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 dont 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
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