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Mysql学习笔记五:时间数据及修改表结构

  • 2026-03-06 02:43:10
Mysql学习笔记五:时间数据及修改表结构
内容小结:这篇学习了时间数据类型,要注意区分datetime与时间戳timestamp,后者具有自动更新特征,同时也第一次了解到主键,修改表的结构是重点内容,其中包含了很多语句内容,需要及时复习。最后要注意在终端操作时一定不能遗漏分号
代码使用:创建表中时间数据类型语句、设置主键语句、修改表结构的Alter系列语句
一、时间数据类型
上面用表格形式整理总结了时间数据类型的分类和各自的特点,下面是语句的具体实现:
CREATE TABLE IF NOT EXISTS t13 (  id INT PRIMARY KEY AUTO_INCREMENT,  birthday DATE,                -- 生日(仅日期)  work_hours TIME,              -- 每日工作时长(仅时间)  create_time DATETIME DEFAULT CURRENT_TIMESTAMP-- 创建时间(默认当前时间)  update_time TIMESTAMP ON UPDATE CURRENT_TIMESTAMP-- 修改时间(自动更新)  join_year YEAR                -- 入职年份DEFAULT CHARSET utf8mb4;
下面我选几个之前没有遇到过的语句功能进行展开介绍:
 id INT PRIMARY KEY AUTO_INCREMENT
  • 创建了一列数据,名称为id,并设置为主键,开启自动递增功能。
  • 「PRIMARY KEY」设置主键,主键是数据表中每一行数据的 “唯一身份证号”,必须满足「唯一不重复」+「非空(NOT NULL)」;设置主键后可以进行快速查询,比如SELECT * FROM user WHERE id=1,比无主键的表查询快几十倍
  • AUTO_INCREMENT」主键自动递增,插入新记录时,不用手动给主键赋值,MySQL 会自动分配一个「比上一条记录的主键值大 1」的数值。例如,利用下面的语句进行添加数据时,系统可以自动为其分配递增的id数字
INSERT INTO 表名 (列1, 列2, ...) VALUES (值1, 值2, ...);
另外一个就是上面表中提到的,要注意DATETIMETIMESTAMP之间的区别
create_time DATETIME DEFAULT CURRENT_TIMESTAMP-- 创建时间(默认当前时间)update_time TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  • 前者是无自动更新特征的,我们下面语句中只是以当前时间进行填充,后面是有自动更新特征的。但是需要一些特定的命令激活。
下面是在sqlyog中操作的记录:
二、表的删除与修改
-- 安全删除(推荐):表存在才删除,无则不报错DROP TABLE IF EXISTS 表名;-- 批量删除多个表DROP TABLE IF EXISTS 表名1, 表名2, 表名3;
修改表的结构主要使用的就是下面语句结构:
ALTER TABLE 表名 [具体修改操作];
请注意,我们这里只给出了修改表格结构,并不是修改表中的某条具体数据,那要用到update,是我后面学习的内容了。下面给出了更加全面的总结:
下面是具体的语句实现,其实知道上表中的内容已经够用了。
# 修改表的操作练习SELECT*FROM t14_emp-- 员工表t14_emp上增加一个image列,varchar类型,要在resume后面ALTER TABLE t14_emp         ADD image VARCHAR(32NOT NULL DEFAULT ''         AFTER RESUMEDESC t14_emp --显示表结构,可以查看表的所有列
-- 修改job列,使其长度为60ALTER TABLE t14_emp	MODIFY job VARCHAR(60NOT NULL DEFAULT ''-- 删除sex列ALTER TABLE t14_empDROP sex-- 表名改为employeeRENAME TABLE t14_emp TO t14_employeeSELECT*FROM t14_employee
-- 修改表的字符集为utf8ALTER TABLE t14_employee CHARSET utf8DROP sex-- 列名name修改为user_nameALTER TABLE t14_employee 	CHANGE `name` `user_name` VARCHAR(32NOT NULL DEFAULT ''DESC t14_employee
三、终端操作注意点
此处,数据库一些基本操作就算是学会够用了,但是这里你会有一个疑问,我现在都是在sqlyog中进行的啊,如果只用终端,我怎么办呢?其实是一样的,只要连接进入数据库,输入相应语句就可以进行操作了。
  • 注意一点,语句末尾加分号 ;。在 MySQL 命令行交互模式下,分号是语句结束的标志。如果没有它,MySQL 会认为你还没写完,会在下一行显示 -> 提示符,等待你继续输入。

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  1. CONNECT:[ UseTime:0.000994s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001447s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000755s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000777s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001424s ]
  6. SELECT * FROM `set` [ RunTime:0.000717s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001503s ]
  8. SELECT * FROM `article` WHERE `id` = 472503 LIMIT 1 [ RunTime:0.006573s ]
  9. UPDATE `article` SET `lasttime` = 1772751892 WHERE `id` = 472503 [ RunTime:0.001565s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000777s ]
  11. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001359s ]
  12. SELECT * FROM `article` WHERE `id` > 472503 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001157s ]
  13. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008728s ]
  14. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009543s ]
  15. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007086s ]
0.225407s