SELECT category_id FROM categories WHERE slug = '221223-n1priglashaem-prinyat-uchastie-v-seminare-ob-izmeneniyah-zakonodatel-stva-po-prodazhe-molochnyh-produktov-tabachnoy-produkcii-a-takzhe-kontrol-nyh-zakupkah-tovarov' LIMIT 0, 1