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 MyISAM、MEMORY、InnoDB 和 BDB表。 作为...
MySQL stores information in different formats. It allows different types of data to be used in different ways. The main types of data arecharacter, numerical, and date and time. When you create a database, you tell MySQL what kind of data to expect in a particular column by using the My...
MySQL Data Types (Version 8.0) In MySQL there are three main data types: string, numeric, and date and time. String Data Types Data typeDescription CHAR(size)A FIXED length string (can contain letters, numbers, and special characters). Thesizeparameter specifies the column length in characters...
MySQLhas a lot of data types that can be used to store various types of data in databases. MySQL structures data into tables that consist of columns related to each other. Each new row in such a table is called a record or entry into the table.2 tables from a database can communicate...
1.String Data Type Syntax In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. For definitions of character string columns (CHAR, VARCHAR, and the TEXT types), MySQL interprets【ɪnˈtɜːrprəts诠释;说明...
1.1 Explicit Default Handling as of MySQL 8.0.13 The default value specified in a DEFAULT clause can be a literal【ˈlɪtərəl字面意义的;缺乏想象力的;完全按原文的;】 constant or an expression. With one exception, enclose expression default values within parentheses【pəˈrɛnθ...
MySQL supports these groups of data types: Numeric Date & time String JSON Choosing the right data types for columns is a part of the initial design of the database. Data types ensure the correctness of the data provided. They ensure that the data is used in a meaningful way. This is ...
MySQL supports an extension for optionally specifying the display width of integer data types in parentheses following the base keyword for the type MySQL Date and Time Types The date and time types represent DATE, TIME, DATETIME, TIMESTAMP, and YEAR. Each type has a range of valid values, ...
Table of content What are SQL Data Types? Defining a Data Type Types of SQL Data Types Data Types in MySQL, SQL Server, Oracle and MS Access Databases MySQL Data Types MS SQL Server Data Types Oracle Data Types MS Access Data Types ...
MySQL supports 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 and more detailed description of the properties of the types in each category, and a summary ...