Question: write a query to return the year, month, and sales columns, along with a 4 th column named prior _ month _ sales showing the

write a query to return the year, month, and sales columns, along with a 4th column named prior_month_sales showing the sales from the prior month. There are only 12 rows in the sales_totals table, one for each month of 2020, so you will not need to group data or filter/ partition on region_id or product_id. Please use a windowing fuction for this as shown in the class video.

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