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Update 1321_Restaurant_Growth.sql #6

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Update 1321_Restaurant_Growth.sql #6

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14 changes: 10 additions & 4 deletions OFFSET-FETCH/1321_Restaurant_Growth.sql
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Original file line number Diff line number Diff line change
@@ -1,15 +1,21 @@
SELECT visited_on,
-- Calculate the rolling sum and average amount over a 7-day window
SELECT
visited_on,

-- Compute the rolling sum of 'amount' over the past 7 days including the current day
SUM(SUM(amount)) OVER (
ORDER BY visited_on
ROWS BETWEEN 6 PRECEDING AND CURRENT ROW
) AS amount,

-- Compute the rolling average of 'amount' over the past 7 days including the current day
CAST(
SUM(SUM(amount)) OVER (
ORDER BY visited_on
ROWS BETWEEN 6 PRECEDING AND CURRENT ROW
)/7.0
AS DECIMAL(10,2)
) AS average_amount
) / 7.0
AS DECIMAL(10, 2)
) AS average_amount
FROM Customer
GROUP BY visited_on
ORDER BY visited_on
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