SELECT case when date_part('dayofweek', orderDate::date) == 0 then 'Sunday'
when date_part('dayofweek', orderDate::date) == 1 then 'Monday'
when date_part('dayofweek', orderDate::date) == 2 then 'Tuesday'
when date_part('dayofweek', orderDate::date) == 3 then 'Wednesday'
when date_part('dayofweek', orderDate::date) == 4 then 'Thursday'
when date_part('dayofweek', orderDate::date) == 5 then 'Friday'
when date_part('dayofweek', orderDate::date) == 6 then 'Saturday' end as year_name
, count(distinct id) as num_orders
FROM products
LEFT JOIN order_items
ON products.SKU = order_items.SKU
LEFT JOIN orders
ON order_items.orderId = orders.id
WHERE products.name = 'Pepperoni Pizza'
GROUP BY 1
ORDER BY 2 DESC