Tuesday, December 29, 2009

Generate random rows with SQL

The secret to retrieve random rows from database is really simple. Here are some example SQL statements that do not require additional application logic.

SQL Server:
SELECT TOP 1 *
FROM Users
ORDER BY NEWID()

MySQL:
SELECT * FROM Users
ORDER BY RAND()
LIMIT
1;

Oracle:
SELECT * FROM
(SELECT * FROM Users
ORDER BY dbms_random.value )
WHERE rownum = 1

PostgreSQL:
SELECT * FROM Users
ORDER BY RANDOM()
LIMIT
1

Access:
SELECT TOP 1 *
FROM Users
ORDER BY Rnd(UserID)


Cheers!

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