博客
关于我
数据库——创建数据库表
阅读量:228 次
发布时间:2019-03-01

本文共 706 字,大约阅读时间需要 2 分钟。

数据库——创建数据库表

用代码创建

-- 注意点;英文括号()   表的名称和字段尽量用``-- AUTO_INCREMENT 自增 一个表只能有一个自增键,而且必须是主键-- 字符串用单引号括起来-- 所有的语句后面加,(英文的)  最后一个不用加-- PRIMARY KEY 设置主键,一个表一般只有唯一的主键CREATE TABLE IF NOT EXISTS `student`(`id` INT(4) NOT NULL AUTO_INCREMENT COMMENT '学号',`name` VARCHAR(30) NOT NULL DEFAULT '匿名' COMMENT '姓名',`pwd` VARCHAR(20) NOT NULL DEFAULT '123456' COMMENT '密码',`sex` VARCHAR(2) NOT NULL DEFAULT '男' COMMENT '性别',`birthday` DATETIME DEFAULT NULL COMMENT '出生日期',`address` VARCHAR(100) DEFAULT NULL COMMENT '家庭住址',`email` VARCHAR (50) DEFAULT NULL COMMENT '邮箱',PRIMARY KEY(`id`))ENGINE=INNODB DEFAULT CHARSET=utf8-- 拓展SHOW CREATE DATABASE school -- 查看数据库的语句SHOW CREATE TABLE student -- 查看表的语句 DESC student  -- 显示表的结构

在这里插入图片描述

转载地址:http://ieov.baihongyu.com/

你可能感兴趣的文章
NN&DL4.3 Getting your matrix dimensions right
查看>>
NN&DL4.7 Parameters vs Hyperparameters
查看>>
NN&DL4.8 What does this have to do with the brain?
查看>>
nnU-Net 终极指南
查看>>
No 'Access-Control-Allow-Origin' header is present on the requested resource.
查看>>
No 'Access-Control-Allow-Origin' header is present on the requested resource.
查看>>
NO 157 去掉禅道访问地址中的zentao
查看>>
no available service ‘default‘ found, please make sure registry config corre seata
查看>>
No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
查看>>
no connection could be made because the target machine actively refused it.问题解决
查看>>
No Datastore Session bound to thread, and configuration does not allow creation of non-transactional
查看>>
No fallbackFactory instance of type class com.ruoyi---SpringCloud Alibaba_若依微服务框架改造---工作笔记005
查看>>
No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalanc
查看>>
No mapping found for HTTP request with URI [/...] in DispatcherServlet with name ...的解决方法
查看>>
No mapping found for HTTP request with URI [/logout.do] in DispatcherServlet with name 'springmvc'
查看>>
No module named 'crispy_forms'等使用pycharm开发
查看>>
No module named cv2
查看>>
No module named tensorboard.main在安装tensorboardX的时候遇到的问题
查看>>
No module named ‘MySQLdb‘错误解决No module named ‘MySQLdb‘错误解决
查看>>
No new migrations found. Your system is up-to-date.
查看>>