MySQL query to delete a row if two columns are equal

Use DELETE for this. Let us first create a table −

mysql> create table DemoTable
(
   Name varchar(40),
   Score1 int ,
   Score2 int
);
Query OK, 0 rows affected (2.71 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('John',56,76);
Query OK, 1 row affected (0.66 sec)
mysql> insert into DemoTable values('Chris',77,77);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('David',89,98);
Query OK, 1 row affected (0.13 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------+--------+--------+
| Name  | Score1 | Score2 |
+-------+--------+--------+
| John  |     56 |     76 |
| Chris |     77 |     77 |
| David |     89 |     98 |
+-------+--------+--------+
3 rows in set (0.00 sec)

Following is the query to delete a row if two columns are equal −

mysql> delete from DemoTable
   where Score1=Score2;
Query OK, 1 row affected (0.29 sec)

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-------+--------+--------+
| Name  | Score1 | Score2 |
+-------+--------+--------+
| John  |     56 |     76 |
| David |     89 |     98 |
+-------+--------+--------+
2 rows in set (0.00 sec)