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...
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...
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...
一 介绍 存储引擎决定了表的类型,而表内存放的数据也要有不同的类型,每种数据类型都有自己的宽度,但宽度是可选的 详细参考: http://www.runoob.com/mysql/mysql-data-types.html http://dev.mysql.com/doc/refman/5.7/en
详细参考链接:http://www.runoob.com/mysql/mysql-data-types.html #数字整型:tinyint int bigint 小数: float:在位数比较短的情况下不精准 double:在位数比较长的情况下不精准0.000001230123123123存成:0.000001230000decimal:(如果用小数,则用推荐使用decimal) ...
MySQL Data Types (Version 8.0) Each column in a database table is required to have a name and a data type. An SQL developer must decide what type of data that will be stored inside each column when creating a table. The data type is a guideline for SQL to understand what type of ...
MySQL数据库工具类之——DataTable批量加入数据库(Net版),MySqlDbHelper通用类希望能对大家有用,代码如下: using MySql.Data.MySqlClient; using System; using System.Collections.Generic; using System.C...
SQL分类1) DDL(Data Definition Language)数据定义语言 用来定义数据库对象:数据库,表,列等。关键字:create, drop,alter 等 2) DML(Data Manipulation Language)数据操作语言 用来对数据库中表的数据进行增删改。关键字:insert, delete, update 等 3) DQL(Data Query Language)数据查询语言 用来查询数据库中表的...
13.9 Using Data Types from Other Database Engines 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. ...
MySQL Data Types——JSON MySQL从5.7.8开始支持JSON,这样带来三个好处: mysql自动验证json格式正确性 优化json存储,提升性能 支持多种json查询 注意 json类型默认值固定是NULL json类型使用character set ofutf8mb4and a collation ofutf8mb4_bin,大小写敏感...