MySQL 8 Administrator???s Guide

Overview of MySQL 8 data types

All standard SQL data types are supported in MySQL. These data types are classified in a few categories, such as numeric types, string types, date and time types, and the JSON data type. When we assign a data type to a column, certain conventions must be followed. These conventions are necessary for MySQL to allow values to be stored in a column:

• M denotes the maximum display width for integer types. For floating point and fixed point types, it is the total number of digits that can be stored. For string types, it is the maximum length. The maximum value allowed depends on the data type.
• D is applicable to floating points and fixed point types. It denotes the number of digits after the decimal point. The maximum ...