MySQL query to get the count of distinct records in a column
To get the count of distinct records, use DISTINCT along with COUNT(). Following is the syntax −
select count(DISTINCT yourColumnName) from yourTableName;
Let us first create a table −
mysql> create table DemoTable
-> (
-> Name varchar(20),
-> Score int
-> );
Query OK, 0 rows affected (0.67 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John',56);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('Sam',89);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable values('John',56);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('Carol',60);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable values('Sam',89);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('Carol',60);
Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −
mysql> select *from DemoTable
Output
This will produce the following output −
+-------+-------+
| Name | Score |
+-------+-------+
| John | 56 |
| Sam | 89 |
| John | 56 |
| Carol | 60 |
| Sam | 89 |
| Carol | 60 |
+-------+-------+
6 rows in set (0.00 sec)
Here is the query to get to get the count of distinct records in a column −
mysql> select count(DISTINCT Score) from DemoTable;
Output
This will produce the following output −
+-----------------------+
| count(DISTINCT Score) |
+-----------------------+
| 3 |
+-----------------------+
1 row in set (0.00 sec)
Published on 10-Jul-2019 13:28:36
