SQL Northwind

9) LEFT JOIN (same as LEFT OUTER JOIN):

a) Using the Products table and ProductSales2019 view, show for all products, the quantity sold in 2019. Display the (i) ProductID and (ii) ProductName for all products in the Products table, and (iii) SumOfQuantitySoldIn2019 (include null values for products not sold in 2019).

b) Using the Products table and ProductSales2019 view, show ProductID, ProductName, and SumOfQualitySoldIn2019 for all Products that were not sold in 2019.