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)