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Mysql学习笔记五:增删改查,select最复杂

  • 2026-04-17 19:19:02
Mysql学习笔记五:增删改查,select最复杂
内容小结针对 table 中具体数据的添加 (insert)、查询 (select)、删除 (delete)、更改 (update)
代码使用:添加 (insert into) 包括添加单条数据与多条数据;删除 (delete) 往往与where联合使用,通过限制条件找到要删除的数据、更改 (update) 利用 set 指定字段进行修改,也要与where联合使用 ,(delete) 与 (update) 一定不要忽略where条件,不然可能会对整个表都进行全局性改动;查询 (select) 一下子就介绍了11种基本的查询场景,也会较多用到where条件,复杂的查询还要结合 group by 分组、order by 排序、limit 分页等附加语句。又介绍where条件子句中常用的比较运算符与逻辑运算符。更多关于 select 的使用链接了其它文章
一、知识点汇总表
本节学习到的增删改查是针对数据表中具体的数据信息,而不是针对表的结构。其中查询是数据库最常用的命令,内容点很多,可能需要多篇文章分解学习。
掌握了这些内容,就可以成为一名资深的CRUD程序员了。(交代一下这个调侃的核心,就是自嘲自己每天做增(Create)查(Retrieve)改(Update)删(Delete)等基础重复的工伤,技术门槛要求低,没有什么进步)
二、insert语句
insert是向数据表中添加数据时的语句,其核心语句的组成是
-- 固定格式INSERT INTO 表名(字段1, 字段2, 字段3        VALUES(值1, 值2, 值3);
可以指定字段进行添加,如果要为表中每个字段都添加值,则不需要点明字段
INSERT INTO 表名        VALUES(值1, 值2, 值3);
下面是在sqlyog中的一些操作实例
上面我们将表t14中的id字段设置成了主键,可以注意一下主键自增的作用啊,在上面示例图中作用表现还是挺明显的。下面我们看一下一次就添加多条数据值,可以参考下面的写法
-- 固定格式INSERT INTO 表名(字段1, 字段2        VALUES(值1,值2), (值3,值4), (值5,值6);
三、delete语句
如果想要删除表格中的某条数据,可以使用delete,它的基础语句构成
DELETE FROM 表名 [WHERE 条件];
DELETE FROM user
  • 这个语句会清空整张表,但是表的结构还在,只是没有数据了,慎用!
四、update语句
UPDATE就是更新、修改表中数据的 SQL 命令,和 DELETE 一样,WHERE 条件是保命符,用错会直接改崩全表数据。
UPDATE 表名        SET 字段名1 = 新值1, 字段名2 = 新值2, ...        [WHERE 筛选条件];
  • 要重视where筛选条件,如果不加 WHERE → 整张表所有数据都被修改
下面为具体示例
UPDATE 表名         SET 列1 = 值1, 列2 = 值2, 列3 = 值3,        WHERE 条件	UPDATE t14_employee         SET salary = salary + 600, job = '军师'        WHERE user_name = '小妖怪'
五、select语句
SELECT是从数据库里把想要的数据取出来,是 CRUD 里用得最多、最基础也最核心的语句。
SELECT [查询字段]        FROM [表名]        [WHERE 筛选条件]        [GROUP BY 分组字段]        [HAVING 分组后筛选]       [ORDER BY 排序字段 [ASC/DESC]       [LIMIT 分页参数] 
下面我通过表格的形式来介绍一些常用的查询方式
为了可以更好地理解上面表中列出的查询功能及具体用法,我们用下面的一张仅含有7条数据的人员基本信息登记表进行示例
人员基本信息登记表
结合上面的登记表,我们又整理了11个查询场景下具体的语句示例及结果说明,更加容易理解。
  • 其实上面基本的语句功能,在实际的操作中还有一些小的技巧,我们做如下介绍。以学生成绩表中的信息为例
学生成绩表
示例一,我们要统计每个学生的总分,并在此基础上加10分
SELECT `name`, (chinese+english+math+10FROM student;
示例二,使用别名表示学生分数,我们看到上面的总分加和,不太美观,我们可以使用下面语句给其一个别名
SELECT `name`, (chinese + english + math) AS total_score        FROM student;
示例三,关于where条件子句的使用技巧,通过其后引出的限制条件,我们可以更加精确地查到我们想要的数据。这个条件设计可以包含比较运算和逻辑运算,详见下表
where条件子句可包含的运算符
下面列出了一列where条件子句的示例,复杂的查询中,比较运算符和逻辑运算符往往结合使用。注意其中的模糊查询 LIKE 哦!
关于查询这部分知识,还有许多其它内容,放在后面的文章中。

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  1. CONNECT:[ UseTime:0.000539s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000796s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000302s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000267s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000609s ]
  6. SELECT * FROM `set` [ RunTime:0.000226s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000656s ]
  8. SELECT * FROM `article` WHERE `id` = 480945 LIMIT 1 [ RunTime:0.000437s ]
  9. UPDATE `article` SET `lasttime` = 1776438789 WHERE `id` = 480945 [ RunTime:0.003550s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000278s ]
  11. SELECT * FROM `article` WHERE `id` < 480945 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001955s ]
  12. SELECT * FROM `article` WHERE `id` > 480945 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000501s ]
  13. SELECT * FROM `article` WHERE `id` < 480945 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000741s ]
  14. SELECT * FROM `article` WHERE `id` < 480945 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011275s ]
  15. SELECT * FROM `article` WHERE `id` < 480945 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002394s ]
0.091146s