MySQLで最も頻繁に発生する値の数を取得しますか？

このためには、GROUP BYとともに集計関数COUNT（）を使用します。まずテーブルを作成しましょう-

mysql> create table DemoTable
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Value int
   );
Query OK, 0 rows affected (0.74 sec)

挿入コマンド-

mysql> insert into DemoTable(Value) values(976);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(Value) values(67);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(Value) values(67);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(Value) values(1);
Query OK, 1 row affected (0.27 sec)
mysql> insert into DemoTable(Value) values(90);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(Value) values(1);
Query OK, 1 row affected (0.41 sec)
mysql> insert into DemoTable(Value) values(67);
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable(Value) values(976);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(Value) values(90);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(Value) values(1);
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable(Value) values(10);
Query OK, 1 row affected (0.09 sec)

selectステートメントを使用してテーブルのすべてのレコードを表示する-

mysql> select *from DemoTable;

出力

+----+-------+
| Id | Value |
+----+-------+
| 1  | 976   |
| 2  | 67    |
| 3  | 67    |
| 4  | 1     |
| 5  | 90    |
| 6  | 1     |
| 7  | 67    |
| 8  | 976   |
| 9  | 90    |
| 10 | 1     |
| 11 | 10    |
+----+-------+
11 rows in set (0.00 sec)

以下は、MySQLで最も頻繁に発生する値の数を取得するためのクエリです-

mysql> select Value,COUNT(Value) AS ValueFrequency
   from DemoTable group by Value order by ValueFrequency DESC;

出力

+-------+----------------+
| Value | ValueFrequency |
+-------+----------------+
| 67    | 3              |
| 1     | 3              |
| 90    | 2              |
| 976   | 2              |
| 10    | 1              |
+-------+----------------+
5 rows in set (0.09 sec)