How to find rows with exact value in one or more columns with MySQL?

For this, you can use GROUP BY HAVING with subquery. Let us first create a table −

mysql> create table DemoTable1861
     (
     Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
     Name varchar(20),
     Marks int
     );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1861(Name,Marks) values('John',45);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1861(Name,Marks) values('Chris',74);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1861(Name,Marks) values('David',89);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1861(Name,Marks) values('Chris',74);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1861(Name,Marks) values('John',49);
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1861;

This will produce the following output −

+----+-------+-------+
| Id | Name  | Marks |
+----+-------+-------+
|  1 | John  |    45 |
|  2 | Chris |    74 |
|  3 | David |    89 |
|  4 | Chris |    74 |
|  5 | John  |    49 |
+----+-------+-------+
5 rows in set (0.00 sec)

Here is the query to find rows with exact value in one or more columns:

mysql> select Id,Name,Marks from DemoTable1861
     where (Name,Marks) IN ( select Name,Marks from DemoTable1861
     group by Name,Marks
     having count(*) > 1);

This will produce the following output −

+----+-------+-------+
| Id | Name  | Marks |
+----+-------+-------+
|  2 | Chris |    74 |
|  4 | Chris |    74 |
+----+-------+-------+
2 rows in set (0.00 sec)