An Error Was Encountered

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND equipment_type.id = equipment_thumbnails.equipment_type_id AND equi' at line 3

SELECT equipment_type.name, equipment_type.id, equipment_thumbnails.file as thumb, equipment_pics.file as enlargement FROM equipment_type, equipment_thumbnails, equipment_pics WHERE equipment_type.category_id = AND equipment_type.id = equipment_thumbnails.equipment_type_id AND equipment_type.id = equipment_pics.equipment_type_id ORDER BY equipment_type.position, equipment_type.name