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Find duplicate column values in MySQL and display them
For this, use GROUP BY HAVING clause. Let us first create a table −
mysql> create table DemoTable1858 ( ModelNumber varchar(50) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1858 values('Audi A4');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1858 values('Audi A6');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1858 values('Audi A4');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1858 values('Audi Q5');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1858 values('Audi R8');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1858 values('Audi Q5');
Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1858;
This will produce the following output −
+-------------+ | ModelNumber | +-------------+ | Audi A4 | | Audi A6 | | Audi A4 | | Audi Q5 | | Audi R8 | | Audi Q5 | +-------------+ 6 rows in set (0.00 sec)
Here is the query to find duplicate column value in MySQL −
mysql> select ModelNumber from DemoTable1858 group by ModelNumber having count(ModelNumber) >=2;
This will produce the following output −
+-------------+ | ModelNumber | +-------------+ | Audi A4 | | Audi Q5 | +-------------+ 2 rows in set (0.00 sec)
Updated on: 2019-12-26T06:39:26+05:30
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