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Randomly SELECT distinct rows in a MySQL table?
To randomly select rows, use ORDER BY RAND() with LIMIT. Use DISTINCT for distinct rows. Let us first see an example and create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(40) ); Query OK, 0 rows affected (0.54 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Name) values('John Doe');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(Name) values('Chris Brown');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(Name) values('Adam Smith');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable(Name) values('John Doe');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable(Name) values('John Doe');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable(Name) values('Chris Brown');
Query OK, 1 row affected (0.53 sec)
mysql> insert into DemoTable(Name) values('Adam Smith');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+-------------+ | Id | Name | +----+-------------+ | 1 | John Doe | | 2 | Chris Brown | | 3 | Adam Smith | | 4 | John Doe | | 5 | John Doe | | 6 | Chris Brown | | 7 | Adam Smith | +----+-------------+ 7 rows in set (0.00 sec)
Following is the query to randomly select two distinct rows in a table −
mysql> select distinct Name from DemoTable order by rand() limit 3;
This will produce the following output −
+-------------+ | Name | +-------------+ | Chris Brown | | John Doe | | Adam Smith | +-------------+ 3 rows in set (0.00 sec)
Updated on: 09-Oct-2019
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