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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)
Updated on: 26-Dec-2019
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