I have the following query:
SELECT plo_categories.description, plo_categories.category_id, plo_items.item_id, plo_items.description, plo_data.value, Count(plo_data.item_id) AS MyCount
FROM plo_categories INNER JOIN (plo_items INNER JOIN plo_data ON plo_items.item_id=plo_data.item_id) ON...