SQL query questions please no special functions. Table: create table sales cust varchar(20), prod varchar(20), day integer, month integer, year integer, state char(2), quant integer, date date Question: For customer and product, show the average sales before, during and after each month (e.g., for February, show average sales of January and March. For "before" January and "after" December, display NULL. The "YEAR" attribute is not considered for this query - for example, both January of 2017 and January of 2018 are considered January regardless of the year. Report: DURING AVG CUSTOMER PRODUCT MONTH BEFORE_AVG AFTER_AVG Boo Fish 284 434 Sam Eggs 254 539 325

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