1054 - Unknown column 'p.SITE_NAME' in 'where clause'

select distinct m.manufacturers_id as id, m.manufacturers_name as name from products p, products_to_categories p2c, manufacturers m where p.SITE_NAME = '1' and (p.manufacturers_id = m.manufacturers_id OR p.uitgever2 = m.manufacturers_id) and p.products_id = p2c.products_id and p2c.categories_id = '29' order by m.manufacturers_name

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