删除 MySQL 中除特定行之外的所有行?
mysqlmysqli database
要删除除单个特定行之外的所有行，请尝试以下语法 −
delete from yourTableName where yourColumnName!=yourValue;
首先我们创建一个表 −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Subject varchar(100) ); Query OK, 0 rows affected (0.65 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable(Subject) values('MySQL');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(Subject) values('MongoDB');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(Subject) values('Java');
Query OK, 1 row affected (0.12 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
+----+---------+ | Id | Subject | +----+---------+ | 1 | MySQL | | 2 | MongoDB | | 3 | Java | +----+---------+ 3 rows in set (0.00 sec)
以下是删除除单个特定行 − 之外的所有行的查询
mysql> delete from DemoTable where Subject!='MongoDB'; Query OK, 2 rows affected (0.19 sec))
让我们再次检查表中的所有记录 −
mysql> select *from DemoTable;
输出
+----+---------+ | Id | Subject | +----+---------+ | 2 | MongoDB | +----+---------+ 1 row in set (0.00 sec)
