Selecting the random rows from a database table for each query fired

 MySQL:

SELECT column FROM table
ORDER BY RAND()
LIMIT 1

 PostgreSQL:

SELECT column FROM table
ORDER BY RANDOM()
LIMIT 1

 Microsoft SQL Server:

SELECT TOP 1 column FROM table
ORDER BY NEWID()

 IBM DB2

SELECT column, RAND() as IDX
FROM table
ORDER BY IDX FETCH FIRST 1 ROWS ONLY

Oracle:

SELECT column FROM
( SELECT column FROM table
ORDER BY dbms_random.value )
WHERE rownum = 1