PHP/MySQL - Best way to create unique random string?

Question

How do I create a random unique string in MySQL?

when I need to create a random string in PHP I use this function:

public function generateString($le         


        

Answer 1

I usually use:

SELECT LEFT(MD5(id), 8)

variants by needings:

SELECT LEFT(UUID(), 8)

SELECT LEFT(MD5(RAND()), 8)