11 Data Types
* data-type-overview Data Type Overview
* numeric-types Numeric Types
* date-and-time-types Date and Time Types
* string-types String Types
* storage-requirements Data Type Storage Requirements
* choosing-types Choosing the Right Type for a Column
* other-vendor-data-types Using Data Types from Other Database Engines
MySQL supports a number of data types in several categories: numeric
types, date and time types, and string (character) types. This chapter
first gives an overview of these data types, and then provides 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 allowable formats in which you can
MySQL also supports extensions for handing spatial data.
spatial-extensions, provides information about these data types.
Several of the data type descriptions use these conventions:
* `M' indicates the maximum display width for integer types. For
floating-point and fixed-point types, M is the total number of
digits. For string types, M is the maximum length. The maximum
allowable 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 maximum
possible value is 30, but should be no greater than M-2.
* Square brackets (‘`['’ and ‘`]'’) indicate optional parts
of type definitions.
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