To delete all rows except a single specific row, try the below syntax −
delete from yourTableName where yourColumnName!=yourValue;
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Subject varchar(100) ); Query OK, 0 rows affected (0.65 sec)
Insert some records in the table using insert command −
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)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+----+---------+ | Id | Subject | +----+---------+ | 1 | MySQL | | 2 | MongoDB | | 3 | Java | +----+---------+ 3 rows in set (0.00 sec)
Here is the query to delete all rows except a single specific ow −
mysql> delete from DemoTable where Subject!='MongoDB'; Query OK, 2 rows affected (0.19 sec)
Let us check all records from the table once again −
mysql> select *from DemoTable;
Output
+----+---------+ | Id | Subject | +----+---------+ | 2 | MongoDB | +----+---------+ 1 row in set (0.00 sec)