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订购记录并在MySQL中删除n行

2024-05-09 00:32:07 427

让我们首先创建一个表-

mysql> create table DemoTable
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> FirstName varchar(20)
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(FirstName) values('Chris');
mysql> insert into DemoTable(FirstName) values('Adam');
mysql> insert into DemoTable(FirstName) values('John');
mysql> insert into DemoTable(FirstName) values('David');
mysql> insert into DemoTable(FirstName) values('Mike');
mysql> insert into DemoTable(FirstName) values('Carol');
mysql> insert into DemoTable(FirstName) values('Sam');

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+----+-----------+
| Id | FirstName |
+----+-----------+
|  1 | Chris     |
|  2 | Adam      |
|  3 | John      |
|  4 | David     |
|  5 | Mike      |
|  6 | Carol     |
|  7 | Sam       |
+----+-----------+
7 rows in set (0.00 sec)

这是查询记录顺序并删除n行的查询-

mysql> delete from DemoTable order by FirstName asc limit 4;

让我们再次检查表记录-

mysql> select *from DemoTable;

这将产生以下输出-

+----+-----------+
| Id | FirstName |
+----+-----------+
|  3 | John      |
|  5 | Mike      |
|  7 | Sam       |
+----+-----------+
3 rows in set (0.00 sec)

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订购记录并在MySQL中删除n行

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