Nettet12. apr. 2024 · 这是由 SpringBoot+MyBatis+Mysql+redis 进行搭建的,主要是redis,为了提升访问速度,一般会将经常查询且不会经常发生改变的数据存入缓存,然后从缓存中查询数据,提升查询速度。这是一个简单基础的配置,适合新手去学习。 Nettet14. apr. 2024 · 1.表的创建、查看、修改、删除 1.1.创建表 1.1.1.主键 (1)在定义列的同时指定主键 CREATE TABLE tb_dept_1 ( id INT (11) Primary Key, name VARCHAR (25), location VARCHAR (50) ); (2)在定义完所有列之后指定主键 CREATE TABLE tb_emp1 ( id INT (11), name VARCHAR (25), deptId INT (11), salary FLOAT, Primary Key (id) ); …
int(1) 和 int(10)区别_我家老洋的博客-CSDN博客
NettetThe MySQL INT data type is commonly used for defining a column that stores integer values. The syntax for creating an INT column is as follows: CREATE TABLE … Nettet12. apr. 2024 · Siemens Gamesa has signed a supply agreement with leading steel company ArcelorMittal’s subsidiary in India to supply 46 SG 3.6-145 wind turbines for a project totaling 166 MW in Andhra Pradesh. The clean electricity produced will be used by one of its steel plants. gately on the nile
Mysql之int(n)长度浅析_mysql int 长度_ldcaws的博客-CSDN博客
NettetThe MySQL uses the following fixed-length unsigned integer variants: int<1>: 1 byte Protocol::FixedLengthInteger. ... An integer that consumes 1, 3, 4, or 9 bytes, … Nettet25. jan. 2024 · mysql数据库作为当前常用的关系型数据库,肯定会遇到设计表的需求,下面对设计表时int类型的设置进行分析。 如对用户表user添加一个user_id字段,数据类型为int,设置为:int(1); mysql中int占4个字节,每个字节为8位(二进制中的8位),那么无符号int的最大值为2^32-1=4294967295,达到40亿,难道用了int(1),就不能存 … Nettet2 dager siden · 我们知道在mysql中 int占4个字节,那么对于无符号的int,最大值是2^32-1 = 4294967295,将近40亿,难道用了int (1),就不能达到这个最大值吗? CREATE TABLE `user` ( `id` int(1) unsigned NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4; 1 2 3 4 id字 … davis field convenience store muskogee ok