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How to delete all rows except some in MySQL?
You can use NOT IN operator for the rows you do not want to delete. Following is the syntax −
delete from yourTableName where yourColumnName NOT IN(‘yourValue1’,‘yourValue2’,‘yourValue3’,.........N);
Let us first create a table −
mysql> create table deleteAllRowsWithCondition -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.84 sec)
Following is the query to insert some records in the table using insert command −
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)
Following is the query to display all records from the table using select statement −
mysql> select * from deleteAllRowsWithCondition;
This will produce the following output −
+----+-------+ | Id | Name | +----+-------+ | 1 | Larry | | 2 | John | | 3 | Sam | | 4 | Mike | | 5 | Carol | | 6 | Bob | | 7 | David | +----+-------+ 7 rows in set (0.00 sec)
Here is the query to delete all rows with some condition. We are not deleting 'John','Mike',and 'Carol' here −
mysql> delete from deleteAllRowsWithCondition where Name NOT IN('John','Mike','Carol');
Query OK, 4 rows affected (0.15 sec)
Let us check whether some rows have been deleted from the table or not. Following is the query −
mysql> select * from deleteAllRowsWithCondition;
This will produce the following output −
+----+-------+ | Id | Name | +----+-------+ | 2 | John | | 4 | Mike | | 5 | Carol | +----+-------+ 3 rows in set (0.00 sec)
Updated on: 2019-07-30T22:30:25+05:30
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