Syntax error MySQL query to select the values having multiple occurrence and display their count

MySQL query to select the values having multiple occurrence and display their count

For this, use GROUP BY HAVING clause. Let us first create a table −

mysql> create table DemoTable673(
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Value int
);
Query OK, 0 rows affected (0.59 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable673(Value) values(10);
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable673(Value) values(20);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable673(Value) values(10);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable673(Value) values(30);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable673(Value) values(20);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable673(Value) values(10);
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable673(Value) values(10);
Query OK, 1 row affected (0.28 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable673;

This will produce the following output −

+----+-------+
| Id | Value |
+----+-------+
|  1 |    10 |
|  2 |    20 |
|  3 |    10 |
|  4 |    30 |
|  5 |    20 |
|  6 |    10 |
|  7 |    10 |
+----+-------+
7 rows in set (0.00 sec)

Following is the query to display only the values having multiple occurrences −

mysql> select Id,count(*) as myValue from DemoTable673 group by Value having count(*) > 1;

This will produce the following output −

+----+---------+
| Id | myValue |
+----+---------+
|  1 |       4 |
|  2 |       2 |
+----+---------+
2 rows in set (0.00 sec)
Updated on: 2019-08-26T06:37:17+05:30

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