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Chapter 11 Data Types

Contents

Table of Contents     [+/-]

11.1 Data Type Overview     [+/-]
11.1.1 Numeric Type Overview
11.1.2 Date and Time Type Overview
11.1.3 String 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 Automatic Initialization and Updating for TIMESTAMP and DATETIME
11.3.5 Fractional Seconds in Time Values
11.3.6 Conversion Between Date and Time Types
11.3.7 Two-Digit Years in Dates
11.4 String Types     [+/-]
11.4.1 The CHAR and VARCHAR Types
11.4.2 The BINARY and VARBINARY Types
11.4.3 The BLOB and TEXT Types
11.4.4 The ENUM Type
11.4.5 The SET Type
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:

  • For integer types, M indicates the maximum display width. For floating-point and fixed-point types, M is the total number of digits that can be stored (the precision). For string types, M is the maximum length. The maximum permissible value of M depends on the data type.

  • D applies 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 than M−2.

  • fsp applies to the TIME, DATETIME, and TIMESTAMP types and represents fractional seconds precision; that is, the number of digits following the decimal point for fractional parts of seconds. The fsp value, 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 created the 26/06/2006, last modified the 26/10/2018
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