Display the count of duplicate records from a column in MySQL and order the result


For this, you need to use GROUP BY for the column name. To get the count, use COUNT(*) and order the result with ORDER BY. Following is the syntax −

select count(*) as anyAliasName from yourTableName group by yourColumnName order By yourAliasName DESC;

Let us first create a table −

mysql> create table DemoTable
(
   Number int
);
Query OK, 0 rows affected (0.82 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(90);
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable values(100);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values(110);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values(90);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values(100);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values(90);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values(120);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values(100);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values(90);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values(120);
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 −

+--------+
| Number |
+--------+
|     90 |
|    100 |
|    110 |
|     90 |
|    100 |
|     90 |
|    120 |
|    100 |
|     90 |
|    120 |
+--------+
10 rows in set (0.00 sec)

Following is the query to display the count of duplicate records and order the result −

mysql> select count(*) as Occured from DemoTable group by Number order By Occured DESC;

This will produce the following output −

+---------+
| Occured |
+---------+
|       4 |
|       3 |
|       2 |
|       1 |
+---------+
4 rows in set (0.00 sec)
raja
Published on 07-Oct-2019 16:17:11
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