mysql unique number generation

Question

I want to generate a unique random integer (from 10000 to 99999) identity just by clean mySQL; any ideas?

I don\'t want to generate this number in php by cycling (ge

Answer 1

I struggled with the solution here for a while and then realised it fails if the column has NULL entries. I reworked this with the following code;

SELECT FLOOR(10000 + RAND() * 89999) AS my_tracker FROM Table1 WHERE "tracker" NOT IN (SELECT tracker FROM Table1 WHERE tracker IS NOT NULL) LIMIT 1

Fiddle here; http://sqlfiddle.com/#!2/620de1/1

Hope its helpful :)

Answer 2

Create a unique index on the field you want the unique random #

Then run

Update IGNORE Table Set RandomUniqueIntegerField=FLOOR(RAND() * 1000000);

Answer 3

I worry about why you want to do this, but you could simply use:

SELECT FLOOR(RAND() * 1000000);

See the full MySQL RAND documentation for more information.

However, I hope you're not using this as a unique identifier (use an auto_increment attribute on a suitably large unsigned integer field if this is what you're after) and I have to wonder why you'd use MySQL for this and not a scripting language. What are you trying to achieve?