For Slovakia, the db doesn't seem to be complete. When I was looking for some source, I've found one one that has almost the same number of rows and also misses the ones I tried to find. There was also packed a db that is more complete and it might be a great idea to process and use that one. Both can be found here: http://www.posta.sk/subory/322/psc-obci-a-ulic.zip (zip contains 2 xml files)