MariaDB [enwiki_p]> select cl_to from page join categorylinks on cl_from = page_id where page_title = 'Tourism_in_Illinois' and page_namespace = 14;
+------------------------------------------------------+
| cl_to                                                |
+------------------------------------------------------+
| Commons_category_with_local_link_same_as_on_Wikidata |
| Economy_of_Illinois                                  |
| Tourism_in_the_United_States_by_state                |
+------------------------------------------------------+
3 rows in set (0.00 sec)

MariaDB [enwiki_p]> select cl_to from page join categorylinks on cl_from = page_id where page_title = 'Duchy_of_Parma' and page_namespace = 14;
Empty set (0.02 sec)

mysql:wikiadmin@db1052 [enwiki]> select cl_to from page join categorylinks on cl_from = page_id where page_title = 'Duchy_of_Parma' and page_namespace = 14;
Empty set (0.00 sec)