8. 3-Day Moving Average
MediumWindow FunctionsAVG() OVERROWS BETWEEN frame
Window frames let you average a sliding range of rows.
Task: for each day return day and mov_avg — the average amount over
the current day and the two days before it (a 3-day trailing window). Round to
2 decimals. Order by day. Early days simply average fewer rows.
Tables
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Expected outputrows must come back in this order
Computing expected output…
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