如何在 MySQL 中删除除部分行以外的所有行?
对于不想删除的行,可以使用 NOT IN 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) -> ); Query OK, 0 rows affected (0.84 sec)
以下是使用 insert 命令向表中插入一些记录的查询 −
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)
以下是删除具有某些条件的所有行的查询。我们在这里不删除“John”、“Mike”和“Carol” −
mysql> delete from deleteAllRowsWithCondition where Name NOT IN('John','Mike','Carol');
Query OK, 4 rows affected (0.15 sec)让我们检查一下是否已从表中删除某些行。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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