使用 MySQL 仅删除表中的特定行
mysqlmysqli database更新于 2024/10/12 15:08:17
要仅删除特定行，请使用 MySQL NOT IN()。让我们首先创建一个表 −
mysql> create table DemoTable1830 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) )AUTO_INCREMENT=101; Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1830(StudentName) values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1830(StudentName) values('David');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1830(StudentName) values('Mike');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1830(StudentName) values('Sam');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1830(StudentName) values('Bob');
Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1830;
这将产生以下输出 −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 101 | Chris | | 102 | David | | 103 | Mike | | 104 | Sam | | 105 | Bob | +-----------+-------------+ 5 rows in set (0.00 sec)
这是仅删除特定行的查询 −
mysql> delete from DemoTable1830
where StudentId NOT IN('101','103','105');
Query OK, 2 rows affected (0.00 sec)
让我们再次检查表记录:
mysql> select * from DemoTable1830;
这将产生以下输出 −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 101 | Chris | | 103 | Mike | | 105 | Bob | +-----------+-------------+ 3 rows in set (0.00 sec)
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mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
