不同資料庫的亂數

MySQL:

SELECT column FROM table
ORDER BY RAND()

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

參考：http://www.petefreitag.com/item/466.cfm