当前位置：网站首页>mysql关于自增和不能为空
mysql关于自增和不能为空
2022-06-27 06:37:00 【CSDN问答】
mysql中auto_increment自增前面为什么要加not null ，明明都会自增，为什么还要写不能为空。这不是多此一举吗？
边栏推荐
- Matlab GUI interface simulation DC motor and AC motor speed simulation
- Fast realization of Bluetooth communication between MCU and mobile phone
- DMU software syntax highlighting VIM setting -- Learning Notes 6
- Unrecognized VM option ‘‘
- AHB2APB桥接器设计（2）——同步桥设计的介绍
- 乐观事务和悲观事务
- win10远程连接云服务器
- Mathematical modeling contest for graduate students - optimal application of UAV in rescue and disaster relief
- Idea one click log generation
- 路由器和交换机的区别
猜你喜欢
POI 替换docx中的文字和图片
![[QT] use structure data to generate read / write configuration file code](/img/f4/685315c92f4e2528652532445fb519.png)
[QT] use structure data to generate read / write configuration file code
SQL injection bypass (I)
如何优雅的写 Controller 层代码？
【OpenAirInterface5g】RRC NR解析之RrcSetupComplete
Scala函数柯里化(Currying)
Centos7.9安装mysql 5.7，并设置开机启动
快速实现单片机和手机蓝牙通信
Yolov6's fast and accurate target detection framework is open source
Fast realization of Bluetooth communication between MCU and mobile phone
随机推荐
Redis 缓存穿透、缓存击穿、缓存雪崩
Tar: /usr/local: cannot find tar in the Archive: due to the previous error, it will exit in the last error state
Get the query parameter in the address URL specify the parameter method
高薪程序员＆面试题精讲系列116之Redis缓存如何实现？怎么发现热key？缓存时可能存在哪些问题？
聊聊领域驱动设计
获取地址url中的query参数指定参数方法
Basic SQL operations in tidb
Classical cryptosystem -- substitution and replacement
Redis cache penetration, cache breakdown, cache avalanche
[QT notes] simple understanding of QT meta object system
Optimistic and pessimistic affairs
Configuring FTP, enterprise official website, database and other methods for ECS
Idea one click log generation
Machine learning
面试官：用分库分表如何做到永不迁移数据和避免热点问题？
TiDB 中的数据库模式概述
The interviewer of a large front-line factory asked: do you really understand e-commerce order development?
Tidb basic functions
vs怎么配置OpenCV？2022vs配置OpenCV详解(多图)
The risk of multithreading -- thread safety