Display records with more than two occurrences in MySQL?

MySQLMySQLi Database

For this, you can use GROUP BY HAVING clause. 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 (0.53 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(Subject) values('MySQL');
Query OK, 1 row affected (0.15 sec)

mysql> insert into DemoTable(Subject) values('MongoDB');
Query OK, 1 row affected (0.09 sec)

mysql> insert into DemoTable(Subject) values('MySQL');
Query OK, 1 row affected (0.10 sec)

mysql> insert into DemoTable(Subject) values('Java');
Query OK, 1 row affected (0.56 sec)

mysql> insert into DemoTable(Subject) values('SQL Server');
Query OK, 1 row affected (0.15 sec)

mysql> insert into DemoTable(Subject) values('MongoDB');
Query OK, 1 row affected (0.13 sec)

mysql> insert into DemoTable(Subject) values('MySQL');
Query OK, 1 row affected (0.48 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

+----+------------+
| Id | Subject    |
+----+------------+
| 1  | MySQL      |
| 2  | MongoDB    |
| 3  | MySQL      |
| 4  | Java       |
| 5  | SQL Server |
| 6  | MongoDB    |
| 7  | MySQL      |
+----+------------+
7 rows in set (0.00 sec)

Following is the query to display distinct records with more than 2 occurrences in MySQL.

mysql> select Subject,count(Subject) freq from DemoTable
   -> group by Subject
   -> having count(Subject) > 2;

Output

+---------+------+
| Subject | freq |
+---------+------+
| MySQL   | 3    |
+---------+------+
1 row in set (0.00 sec)
raja
Published on 10-Jul-2019 11:18:24
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