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Order randomly in MySQL with a random value column?
Let us first create a table. After that we will create a new random value column and order the record randomly:
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) ); Query OK, 0 rows affected (0.57 sec)
Following is the query to insert some records in the table using insert command:
mysql> insert into DemoTable(StudentName) values('Larry');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(StudentName) values('Sam');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentName) values('Mike');
Query OK, 1 row affected (0.34 sec)
mysql> insert into DemoTable(StudentName) values('Carol');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(StudentName) values('Robert');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentName) values('Chris');
Query OK, 1 row affected (0.14 sec)Following is the query to display records from the table using select statement:
mysql> select *from DemoTable;
This will produce the following output
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1 | Larry | | 2 | Sam | | 3 | Mike | | 4 | Carol | | 5 | Robert | | 6 | Chris | +-----------+-------------+ 6 rows in set (0.00 sec)
Here is the query to order by random fields. We have created a new random field here:
mysql> SELECT * FROM (SELECT StudentName, RAND()+1 AS randomRecord FROM DemoTable ) tbl ORDER BY RandomRecord DESC;
This will produce the following output
+-------------+--------------------+ | StudentName | RandomRecord | +-------------+--------------------+ | Carol | 1.8973721451101566 | | Chris | 1.7821308670399065 | | Mike | 1.4640037673190271 | | Larry | 1.4134691557041081 | | Sam | 1.1408822407395414 | | Robert | 1.0948494543273461 | +-------------+--------------------+ 6 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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