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如何删除除MySQL中的某些行以外的所有行？

2024-05-02 04:10:03 403

您可以对不想删除的行使用NOTIN运算符。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)
   -> );

以下是使用insert命令在表中插入一些记录的查询-

mysql> insert into deleteAllRowsWithCondition(Name) values('Larry');

mysql> insert into deleteAllRowsWithCondition(Name) values('John');

mysql> insert into deleteAllRowsWithCondition(Name) values('Sam');

mysql> insert into deleteAllRowsWithCondition(Name) values('Mike');

mysql> insert into deleteAllRowsWithCondition(Name) values('Carol');

mysql> insert into deleteAllRowsWithCondition(Name) values('Bob');

mysql> insert into deleteAllRowsWithCondition(Name) values('David');

以下是使用select语句显示表中所有记录的查询-

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)

这是删除具有某些条件的所有行的查询。我们不会在此处删除“John”，“Mike”和“Carol”-

mysql> delete from deleteAllRowsWithCondition where Name NOT IN('John','Mike','Carol');

让我们检查是否从表中删除了某些行。以下是查询-

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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如何删除除MySQL中的某些行以外的所有行？

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