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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)
Updated on: 30-Jun-2020
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