Sorry for my mediocre english. What I wanted to say was: There is no need to use any number because the day your new data is added by a Perl routine for example, every Link will get its unique ID by automatically increasing the number of the last Link from the Links table because you have selected auto_increment. You could even do this by adding such a routine to the perl-script. We use this to update our products database for our online-LinksSQL-shop.

Regards

Niko