Count the same value of each row in a MySQL column?

To count the same value of each row, use COUNT(*) along with GROUP BY clause. Let us first create a table −

mysql> create table DemoTable1818
     (
     Id int,
     Name varchar(20)
     );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1818 values(10,'Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1818 values(11,'Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1818 values(11,'Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1818 values(12,'Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1818 values(10,'Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1818 values(10,'Chris');
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1818;

This will produce the following output −

+------+-------+
| Id   |  Name |
+------+-------+
|   10 | Chris |
|   11 | Chris |
|   11 | Chris |
|   12 | Chris |
|   10 | Chris |
|   10 | Chris |
+------+-------+
6 rows in set (0.00 sec)

Here is the query to count the same value of each row in a column −

mysql> select Id,count(*) as TotalPerId from DemoTable1818 group by Id;

This will produce the following output −

+------+------------+
| Id   | TotalPerId |
+------+------------+
|   10 |          3 |
|   11 |          2 |
|   12 |          1 |
+------+------------+
3 rows in set (0.00 sec)