如何在 MySQL 中删除第 n 行?\n
要删除 MySQL 中的第 n 行,可以使用 DELETE 语句与子查询配合使用。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)
以下是使用 insert 命令在表中插入某些记录的查询
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 命令从表中显示记录的查询
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)
从表中显示所有记录来检查记录是否已删除
mysql> select * from DemoTable1;
这将产生以下输出。现在的第 2nd 记录已删除
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1 | Larry | | 3 | Mike | | 4 | Carol | | 5 | David | | 6 | Bob | +-----------+-------------+ 5 rows in set (0.00 sec)
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