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mysql数据类型实战
mysql数据类型实战
MySQL数据类型
-整数
类型实战
1.背景*
MySQL
支持SQL标准整数
类型
整数(或INT)和SMALLINT。作为标准的扩展,
MySQL
还支持整数
类型
TINYINT、MEDIUMINT和BIGINT 2.整数
类型
所需的存储和值范围
类型
占用空间 最小值 最大值(字节)(signed/Unsigned)(signed/Unsigned)TINYINT ...
MySQL数据类型
-浮点
类型实战
1.背景*
MySQL
支持的浮点
类型
中有单精度
类型
(float),双精度
类型
(double),和高精度
类型
(decimal),在数字货币
类型
中推荐使用高精度
类型
(decimal)来进行应用.*
MySQL
浮点
型
和定点
型
可以用
类型
名称后加(M,D)来表示,M表示该值的总共长度,D...
MySQL数据类型
-枚举与集合
类型实战
1.背景*
MySQL数据库
提供针对字符串存储的两种特殊
数据类型
:枚举类型ENUM和集合类型SET,集合类型
数据类型
可以给予我们更多提高性能、降低存储容量和降低程序代码理解的技巧。2.枚举与集合类型所属空间与最大成员数量 类型 占用字节 最大...
MySQL数据类型
-字符串
类型实战
1.背景*
MySQL
支持的字符串
类型
有CHAR、VARCHAR、二进制、var二进制、BLOB、文本等等。2.字符串
类型
所需的存储和值范围
类型
说明 N的含义 是否有字符集 最大长度 CHAR(N)定义字符 字符 是 255 VARCHAR(N)变长字符 字符 是 16384 BINARY(N)...
MySQL数据类型
-日期与时间
类型实战
1.背景*
MySQL
支持多种表示日期和时间的
数据类型
,如YEAR、TIME、DATETIME、TIMESTAMP等等……*
MySQL
5.6.4版本开始支持微秒(支持类型:TIMTE、DATETIME、TIMESTAMP,微秒长度最大为6)2.日期与时间类型所属空间与表示范围 类型 5.6.4版本之前...
1
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云数据库RDS MySQL版
MySQL 是全球最受欢迎的开源数据库,阿里云MySQL版 通过深度的内核优化和独享实例提供稳定极致的数据库性能,同时灵活的部署架构及产品形态,可满足不同场景下的数据库需求。
了解详情
管理控制台
在线咨询
最新活动
MySQL 1年仅19.9元
数据库专场优惠
快速入门
帮助文档
快速入门
最佳实践
SaaS上云数据库
数据库客户案例合集
产品推荐
云数据库PolarDB
云原生数据仓库MySQL
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云数据库RDS MySQL版
MySQL 是全球最受欢迎的开源数据库,阿里云MySQL版 通过深度的内核优化和独享实例提供稳定极致的数据库性能,同时灵活的部署架构及产品形态,可满足不同场景下的数据库需求。
了解详情
管理控制台
在线咨询
最新活动
MySQL 1年仅19.9元
数据库专场优惠
快速入门
帮助文档
快速入门
最佳实践
SaaS上云数据库
数据库客户案例合集
产品推荐
云数据库PolarDB
云原生数据仓库MySQL