Select a random row with MySQL

 SELECT column FROM table
 ORDER BY RAND()
 LIMIT 1

Select a random row with PostgreSQL

 SELECT column FROM table
 ORDER BY RANDOM()
 LIMIT 1

Select a random row with Microsoft SQL Server

 SELECT TOP 1 column FROM table
 ORDER BY NEWID()

Select a random row with IBM DB2

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

Select a random record with Oracle

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