MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
- 13.1.1 Numeric Data Type Syntax
- 13.1.2 Integer Types (Exact Value) - INTEGER, INT, SMALLINT, TINYINT, MEDIUMINT, BIGINT
- 13.1.3 Fixed-Point Types (Exact Value) - DECIMAL, NUMERIC
- 13.1.4 Floating-Point Types (Approximate Value) - FLOAT, DOUBLE
- 13.1.5 Bit-Value Type - BIT
- 13.1.6 Numeric Type Attributes
- 13.1.7 Out-of-Range and Overflow Handling
MySQL supports all standard SQL numeric data types. These types
include the exact numeric data types
(INTEGER,
SMALLINT,
DECIMAL, and
NUMERIC), as well as the
approximate numeric data types
(FLOAT,
REAL, and
DOUBLE PRECISION). The keyword
INT is a synonym for
INTEGER, and the keywords
DEC and
FIXED are synonyms for
DECIMAL. MySQL treats
DOUBLE as a synonym for
DOUBLE PRECISION (a nonstandard
extension). MySQL also treats REAL
as a synonym for DOUBLE PRECISION
(a nonstandard variation), unless the
REAL_AS_FLOAT SQL mode is
enabled.
The BIT data type stores bit values
and is supported for MyISAM,
MEMORY,
InnoDB, and
NDB tables.
For information about how MySQL handles assignment of out-of-range values to columns and overflow during expression evaluation, see Section 13.1.7, “Out-of-Range and Overflow Handling”.
For information about storage requirements of the numeric data types, see Section 13.7, “Data Type Storage Requirements”.
For descriptions of functions that operate on numeric values, see Section 14.6, “Numeric Functions and Operators”. The data type used for the result of a calculation on numeric operands depends on the types of the operands and the operations performed on them. For more information, see Section 14.6.1, “Arithmetic Operators”.