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<>DML常见的命令
* insert into
* update
* delete
<>插入数据 insert into
* 方式一 (不推荐) insert into 表名 values (值1， 值2 ， ....);
PS: 从命令行无法看到插入的字段是什么，无法确定插入数据的个数，过分的依赖与数据库的表结构顺序
在插入的时候，值顺序必须和表结构的顺序保持完全一致，且个数相同
* 方式二 (推荐) insert into 表名(字段1, 字段2, ...) values (值1, 值2 , ...);
<>批量插入
insert into 表名(字段1, 字段2, ...) value (值1, 值2 , ...) , (值1, 值2 , ...) , (值1, 值2
, ...) , (值1, 值2 , ...) , (值1, 值2 , ...) , (值1, 值2 , ...) ... ;
PS: 在插入的时候， value 和 values 都可以进行设置数据
values 适合与 单条记录的插入，速度相对比较快
value 适合与 批量插入，速度相对比较快
<>数据的更新 update
是在原数据的基础上，对已存在的数据的某些字段对应的值进行更改、不会产生新纪录
-- 全表更新 （不推荐使用） update 表 set 字段1 = 值1 , 字段2=值2 , ... ; -- 按照某种条件进行数据的更新 (推荐)
update 表 set 字段1 = 值1 , 字段2=值2 , ... where 条件 ;
<>删除数据 delete
-- 全表删除 （不推荐使用） delete from 表 ; -- 带条件的删除 (推荐) delete from 表 where 条件 ;
<>全表删除
* delete from 表 ; （不推荐）
* truncate table 表 ; (推荐)
