1. Kirkwood Center for Continuing Education
Introduction to PHP and MySQL
Kirkwood Center for Continuing Education
By Fred McClurg,
Copyright © 2016, Fred McClurg, All Rights Reserved.

2. Chapter Nine MySQL Data Types

3. MySQL Numeric Integer Data Types
Field Type
Description
Range
Unsigned
BIT[(m)]
A bit-field type.
1 to 64
TINYINT[(m)]
A very small integer.
-128 to 127
0 to 255
BOOLEAN
Synonym for TINYINT(1).
TRUE or FALSE
SMALLINT[(m)]
A small integer.
-32,768 to 32,767
(thousands)
0 to 65,535
MEDIUMINT[(m)]
A medium-sized integer.
-8,388,608 to 8,388,607 (millions)
0 to 16,777,215
INT[(m)]
A normal-size integer.
-2,147,483,648 to 2,147,483,647 (billions)
0 to 4,294,967,295
BIGINT[(m)]
A large integer.
-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 (quintillion)
0 to 18,446,744,073,709,551,615

4. MySQL Numeric Decimal Data Types
Field Type
Description
FLOAT[(m,d)]
A small (single-precision) floating-point number.
DOUBLE[(m,d)]
A normal-size (double-precision) floating-point number.

5. MySQL Date and Time Data Types
Field Type
Description
Format
DATE
A date.
YYYY-MM-DD
DATETIME
A date and time combination.
YYYY-MM-DD HH:MM:SS
TIMESTAMP
A timestamp whose values are stored as number of seconds since epoch (' :00:00').
TIME
A time.
HH:MM:SS
YEAR[(2|4)]
A year in two-digit or four-digit format.
YYYY

6. MySQL String Data Types
Field Type
Description
Range
CHAR[(m)]
A fixed-length string that is always right-padded with spaces to the specified length.
0 to 255
VARCHAR(m)
A variable-length string. m represents the maximum column length in characters.
0 to 65,535 bytes
TEXT[(m)]
Non-binary character string
65,535 character max.
BLOB[(m)]
Binary large object that can hold a variable amount of data.
65,535 byte max.

7. MySQL String Data Types (cont.)
Field Type
Description
Range
TINYTEXT
A small text column
255 character max
MEDIUMTEXT
A medium-sized text column
16,777,215 character max
LONGTEXT
A large text column
4,294,967,295 or 4GB character max
ENUM('value1', 'value2', )
An enumeration
A maximum of 65,535 distinct values
SET('value1', 'value2', )
A set
A maximum of 64 members

8. MySQL Default Data Type Values
Field Type
Description
CURRENT_DATE
Returns the current date as a value in 'YYYY-MM-DD'
CURRENT_TIME
Returns the current time as a value in 'HH:MM:SS'
CURRENT_TIMESTAMP
or NOW (an alias for CURRENT_TIMESTAMP)
Returns the current date and time as a value in 'YYYY-MM-DD HH:MM:SS'
Example:
CREATE TABLE book (
creation TIMESTAMP DEFAULT NOW() );

9. to be continued ...