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Chapter 11 Data Types
Table of Contents [+/-]
- 11.1 Data Type Overview [+/-]
- 11.2 Numeric Types [+/-]
- 11.2.1 Integer Types (Exact Value) - INTEGER, INT, SMALLINT, TINYINT, MEDIUMINT, BIGINT
- 11.2.2 Fixed-Point Types (Exact Value) - DECIMAL, NUMERIC
- 11.2.3 Floating-Point Types (Approximate Value) - FLOAT, DOUBLE
- 11.2.4 Bit-Value Type - BIT
- 11.2.5 Numeric Type Attributes
- 11.2.6 Out-of-Range and Overflow Handling
- 11.3 Date and Time Types [+/-]
- 11.3.1 The DATE, DATETIME, and TIMESTAMP Types
- 11.3.2 The TIME Type
- 11.3.3 The YEAR Type
- 11.3.4 Migrating YEAR(2) Columns to YEAR(4)
- 11.3.5 Automatic Initialization and Updating for TIMESTAMP and DATETIME
- 11.3.6 Fractional Seconds in Time Values
- 11.3.7 Conversion Between Date and Time Types
- 11.3.8 Two-Digit Years in Dates
- 11.4 String Types [+/-]
- 11.5 Spatial Data Types [+/-]
- 11.5.1 Spatial Data Types
- 11.5.2 The OpenGIS Geometry Model
- 11.5.3 Supported Spatial Data Formats
- 11.5.4 Geometry Well-Formedness and Validity
- 11.5.5 Spatial Reference System Support
- 11.5.6 Creating Spatial Columns
- 11.5.7 Populating Spatial Columns
- 11.5.8 Fetching Spatial Data
- 11.5.9 Optimizing Spatial Analysis
- 11.5.10 Creating Spatial Indexes
- 11.5.11 Using Spatial Indexes
- 11.6 The JSON Data Type
- 11.7 Data Type Default Values
- 11.8 Data Type Storage Requirements
- 11.9 Choosing the Right Type for a Column
- 11.10 Using Data Types from Other Database Engines
MySQL supports a number of SQL data
types in several categories: numeric types, date and time types,
string (character and byte) types, spatial types, and the
JSON data type. This chapter provides
an overview of these data types, a more detailed description of the
properties of the types in each category, and a summary of the data
type storage requirements. The initial overview is intentionally
brief. The more detailed descriptions later in the chapter should be
consulted for additional information about particular data types,
such as the permissible formats in which you can specify values.
Data type descriptions use these conventions:
Mindicates the maximum display width for integer types. For floating-point and fixed-point types,Mis the total number of digits that can be stored (the precision). For string types,Mis the maximum length. The maximum permissible value ofMdepends on the data type.Dapplies to floating-point and fixed-point types and indicates the number of digits following the decimal point (the scale). The maximum possible value is 30, but should be no greater thanM−2.fspapplies to theTIME,DATETIME, andTIMESTAMPtypes and represents fractional seconds precision; that is, the number of digits following the decimal point for fractional parts of seconds. Thefspvalue, if given, must be in the range 0 to 6. A value of 0 signifies that there is no fractional part. If omitted, the default precision is 0. (This differs from the standard SQL default of 6, for compatibility with previous MySQL versions.)Square brackets (
[and]) indicate optional parts of type definitions.
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Document créé le 26/06/2006, dernière modification le 26/10/2018
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