Better !!top!!: Martin Gruber Understanding Sqlpdf

References: Gruber, M. (2019). Understanding SQL. 6th ed.

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SELECT current.product_id, current.sales as sales_this_month, previous.sales as sales_last_month, (current.sales - previous.sales) as variance FROM (SELECT product_id, SUM(sales) as sales FROM monthly_sales WHERE month = 'June') as current LEFT JOIN (SELECT product_id, SUM(sales) as sales FROM monthly_sales WHERE month = 'May') as previous ON current.product_id = previous.product_id; References: Gruber, M

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