MySQL 如何删除除某些行之外的所有行

您可以使用 NOT IN 操作符来排除要删除的行。以下是语法 −

delete from yourTableName where yourColumnName NOT
IN(‘yourValue1’,‘yourValue2’,‘yourValue3’,.........N);

让我们首先创建一个表 −

mysql> create table deleteAllRowsWithCondition
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> Name varchar(20)
   -> );
Query OK, 0 rows affected (0.84 sec)

以下是使用插入命令在表中插入一些记录的查询语句 −

mysql> insert into deleteAllRowsWithCondition(Name) values('Larry');
Query OK, 1 row affected (0.14 sec)

mysql> insert into deleteAllRowsWithCondition(Name) values('John');
Query OK, 1 row affected (0.21 sec)

mysql> insert into deleteAllRowsWithCondition(Name) values('Sam');
Query OK, 1 row affected (0.12 sec)

mysql> insert into deleteAllRowsWithCondition(Name) values('Mike');
Query OK, 1 row affected (0.16 sec)

mysql> insert into deleteAllRowsWithCondition(Name) values('Carol');
Query OK, 1 row affected (0.14 sec)

mysql> insert into deleteAllRowsWithCondition(Name) values('Bob');
Query OK, 1 row affected (0.06 sec)

mysql> insert into deleteAllRowsWithCondition(Name) values('David');
Query OK, 1 row affected (0.14 sec)

以下是使用 select 语句从表中显示所有记录的查询语句 −

mysql> select * from deleteAllRowsWithCondition;

这将产生以下输出 −

+----+-------+
| Id | Name  |
+----+-------+
| 1  | Larry |
| 2  | John  |
| 3  | Sam   |
| 4  | Mike  |
| 5  | Carol |
| 6  | Bob   |
| 7  | David |
+----+-------+
7 rows in set (0.00 sec)

这是删除带有某些条件的所有行的查询。我们在此处不删除 ‘John’、’Mike’ 和 ‘Carol’ −

mysql> delete from deleteAllRowsWithCondition where Name NOT IN('John','Mike','Carol');
Query OK, 4 rows affected (0.15 sec)

让我们检查表中是否已删除某些行。以下是查询语句 −

mysql> select * from deleteAllRowsWithCondition;

这将产生以下输出 −

+----+-------+
| Id | Name  |
+----+-------+
| 2  | John  |
| 4  | Mike  |
| 5  | Carol |
+----+-------+
3 rows in set (0.00 sec)

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