Query SQL: http://localhost/phpmyadmin/themes/dot.gifSELECT categories.CategoryName ASCategoria, products.ProductName ASProdotto, AVG( UnitPrice ) AS 'Prezzo Medio'
FROM `products`
WHERE categories.CategoryName ='Condiments';

Messaggio di MySQL: http://localhost/phpmyadmin/themes/dot.gif
#1054 - Unknown column 'categories.CategoryName' in 'field list'