I've been looking at fast ways to select a random row from a table and have found the following site: http://74.125.77.132/search?q=cache:http://jan.kneschke.de/projects/mysql/order-by-rand/&hl=en&strip=1

What I want to do is to select a random url from my table 'urls' that I DON'T have in my other table 'urlinfo'.The query I am using now selects a random url from 'urls' but I need it modified to only return a random url that is NOT in the 'urlinfo' table.

Heres the query:

SELECT url 
FROM urls JOIN (SELECT CEIL(RAND() * (SELECT MAX(urlid)
                                     FROM urls
                                     )
                           ) AS urlid 
               ) AS r2 USING(urlid);

And the two tables:

CREATE TABLE urls (
 urlid INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
 url VARCHAR(255) NOT NULL,
) ENGINE=INNODB;


CREATE TABLE urlinfo (
 urlid  INT NOT NULL PRIMARY KEY,
 urlinfo VARCHAR(10000),
 FOREIGN KEY (urlid) REFERENCES urls (urlid)
   ) ENGINE=INNODB;