删除 MySQL 中的第 n 行?\
mysqlmysqli database
要删除 MySQL 中的第 n 行，请使用 DELETE 语句并使用子查询。让我们首先创建一个表:
mysql> create table DemoTable1 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100) -> ); Query OK, 0 rows affected (0.99 sec)
下面是使用 insert 命令在表中插入一些记录的查询:
mysql> insert into DemoTable1(StudentName) values('Larry');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable1(StudentName) values('Sam');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable1(StudentName) values('Mike');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1(StudentName) values('Carol');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1(StudentName) values('David');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable1(StudentName) values('Bob');
Query OK, 1 row affected (0.13 sec)
以下是使用 select 命令显示表中记录的查询:
mysql> select * from DemoTable1;
这将产生以下输出 −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1 | Larry | | 2 | Sam | | 3 | Mike | | 4 | Carol | | 5 | David | | 6 | Bob | +-----------+-------------+ 6 rows in set (0.00 sec)
以下是删除第 n 行的查询:
mysql> delete from DemoTable1 where StudentId = (select StudentId from (select StudentId from DemoTable1 order by StudentId limit 1,1) as tbl); Query OK, 1 row affected (0.19 sec)
显示表中的所有记录以检查记录是否已被删除:
mysql> select * from DemoTable1;
这将产生以下输出。记录 2nd 现已被删除:
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1 | Larry | | 3 | Mike | | 4 | Carol | | 5 | David | | 6 | Bob | +-----------+-------------+ 5 rows in set (0.00 sec)
