The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. MySQL Data Types (Version 8.0) Each column in a database table is required to have a name and a data type. ...
MySQL 支持所有标准 SQL 数值数据类型。 这些类型包括严格数值数据类型(INTEGER、SMALLINT、DECIMAL 和 NUMERIC),以及近似数值数据类型(FLOAT、REAL 和 DOUBLE PRECISION)。 关键字INT是INTEGER的同义词,关键字DEC是DECIMAL的同义词。 BIT数据类型保存位字段值,并且支持 ...
MySQL supports a number ofSQL standard data typesin various categories. MySQL hasNumericTypes, theDATETIME,DATE, andTIMESTAMPTypes andStringTypes. Data types are discussed on this page are based on MySQL community server 5.6 MySQL Numeric Types MySQL supports all standard SQL numeric data types whi...
TheTIMEdata type is used to display time in MySQL. It shows values inHH:MM:SSformat. MySQL retrieves and displaysTIMEvalues in 'HH:MM:SS' format or 'HHH:MM:SS' format for large hours values. The range is from-838:59:59to838:59:59. The hours part of the time format may be grea...
• If strict mode is not enabled, MySQL sets the column to the implicit default value for the column data type. Suppose that a table t is defined as follows: CREATETABLEt (iINTNOTNULL); In this case, i has no explicit default, so in strict mode each of the following statements produ...
As of MySQL 8.0.17, the ZEROFILL attribute is deprecated for numeric data types; you should expect support for it to be removed in a future version of MySQL. Consider using an alternative means of producing the effect of this attribute. For example, applications could use the LPAD() functio...
Chapter 16. MySQL Data Types MySQL offers a wide variety of data types to support the storage of different kinds of data. This chapter lists the full range of these data types and describes their functionality, syntax, and data storage requirements. For each data type, the syntax shown uses...
不同的存储引擎表示数据类型和存储原始数据的方式不同,表数据可能会针对一列或整行进行压缩,从而使表或列的存储要求的计算变得复杂,但通过MySQL API提供了统一对外的接口,从而不用考虑底层的细节实现 表的内部表示最大行大小为 65,535 字节,可以理解为一行总长度的限制为 65,535 字节,这里有个注意点就一张表中...
读MySQL5.7文档11.2 Date and Time Data Types MySQL的时间类型分为DATE, DATETIME, TIMESTAMP, TIME, YEAR五个类型。接下来为大家一一介绍下。 DATE类型 存储YYYY-MM-DD类型的时间,取值范围是'1000-01-01' to '9999-12-31'。 DATETIME和TIMESTAMP类型 ...
To facilitate the use of code written for SQL implementations from other vendors, MySQL maps data types as shown in the following table. These mappings make it easier to import table definitions from other database systems into MySQL. Other Vendor TypeMySQL Type ...