SQL Intermediate Certification on Hacker rank || Find the List of Products which were not Sold ?

How to Earn SQL (Advanced) Certification on Hackerank ?
In this video, you'll learn how to earn free certification from Hackerrank
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[@13.AkashDas]

Hi Vivek, thanks for the solution but I have a question over here. Can it be solved using left join?
select p.sku, p.product_name
from product as p
left join invoice_item as i on
p.id=i.product_id
where i.product_id is null
order by p.sku asc