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MySQL Reference Manual :: 11 Column Types
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- Preface
- 1 General Information
- 2 Installing MySQL
- 3 MySQL Tutorial
- 4 Using MySQL Programs
- 5 Database Administration
- 6 Replication in MySQL
- 7 MySQL Optimization
- 8 MySQL Client and Utility Programs
- 9 Language Structure
- 10 Character Set Support
- 11 Column Types
- 12 Functions and Operators
- 13 SQL Statement Syntax
- 14 MySQL Storage Engines and Table Types
- 15 The InnoDB Storage Engine
- 16 MySQL Cluster
- 17 Introduction to MaxDB
- 18 Spatial Extensions in MySQL
- 19 Stored Procedures and Functions
- 20 Triggers
- 21 Views
- 22 The INFORMATION_SCHEMA Information Database
- 23 Precision Math
- 24 MySQL APIs
- 25 MySQL Connectors
- 26 Error Handling in MySQL
- 27 Extending MySQL
- A Problems and Common Errors
- B Credits
- C MySQL and the Future (the TODO)
- D MySQL Change History
- E Porting to Other Systems
- F Environment Variables
- G MySQL Regular Expressions
- H GNU General Public License
- I MySQL FLOSS License Exception
- Index
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MySQL supports a number of column types in several categories: numeric types, date and time types, and string (character) types. This chapter first gives an overview of these column types, and then provides a more detailed description of the properties of the types in each category, and a summary of the column type storage requirements. The overview is intentionally brief. The more detailed descriptions should be consulted for additional information about particular column types, such as the allowable formats in which you can specify values.
MySQL versions 4.1 and up support extensions for handing spatial data. Information about spatial types is provided in Chapter 18, Spatial Extensions in MySQL.
Several of the column type descriptions use these conventions:
-
MIndicates the maximum display width. The maximum legal display width is 255.
-
DApplies to floating-point and fixed-point types and indicates the number of digits following the decimal point. The maximum possible value is 30, but should be no greater than
M-2. -
Square brackets ('
[' and ']') indicate parts of type specifiers that are optional.
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