> In an SQL server, you'd use a SEQUENCE:
> 
>   SELECT NEXT VALUE FOR MY_BLA_SEQ FROM <...>
> 

Here's a good read about how Flickr manage their unique IDs using MySQL:

http://code.flickr.com/blog/2010/02/08/ticket-servers-distributed-unique-primary-keys-on-the-cheap/

clint


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