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Update total-sales-amount-by-year.sql #120

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Update total-sales-amount-by-year.sql #120

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121 changes: 75 additions & 46 deletions MySQL/total-sales-amount-by-year.sql
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Original file line number Diff line number Diff line change
@@ -1,38 +1,4 @@
# Time: O(nlogn)
# Space: O(n)

SELECT product_id,
product_name,
report_year,
(DATEDIFF(
CASE WHEN YEAR(period_end) > report_year THEN CONCAT(report_year, '-12-31') ELSE period_end END,
CASE WHEN YEAR(period_start) < report_year THEN CONCAT(report_year, '-01-01') ELSE period_start END
) + 1) * average_daily_sales AS total_amount
FROM (SELECT s.product_id,
product_name,
period_start,
period_end,
average_daily_sales
FROM sales s
INNER JOIN product p
ON s.product_id = p.product_id
) AS r,
(SELECT "2018" AS report_year
UNION ALL
SELECT "2019"
UNION ALL
SELECT "2020"
) AS y
WHERE YEAR(period_start) <= report_year AND
YEAR(period_end) >= report_year
GROUP BY product_id,
report_year
ORDER BY product_id,
report_year;


# Time: O(nlogn)
# Space: O(n)
-- hard coded
SELECT r.product_id,
product_name,
report_year,
Expand All @@ -43,10 +9,14 @@ FROM ((SELECT product_id,
FROM (SELECT product_id,
average_daily_sales,
DATEDIFF(
CASE WHEN period_end > '2018-12-31' THEN '2018-12-31' ELSE period_end END,
CASE WHEN period_start < '2018-01-01' THEN '2018-01-01' ELSE period_start END
DAY, -- added
period_start,
CASE WHEN period_end > '2018-12-31' THEN '2018-12-31' ELSE period_end END
--CASE WHEN period_start < '2018-01-01' THEN '2018-01-01' ELSE period_start END
) + 1 AS days
FROM sales s) tmp
FROM #Sales s
WHERE DATEPART(YEAR, period_start) = 2018 -- added
) tmp
WHERE days > 0)
UNION ALL
(SELECT product_id,
Expand All @@ -55,10 +25,14 @@ FROM ((SELECT product_id,
FROM (SELECT product_id,
average_daily_sales,
DATEDIFF(
CASE WHEN period_end > '2019-12-31' THEN '2019-12-31' ELSE period_end END,
CASE WHEN period_start < '2019-01-01' THEN '2019-01-01' ELSE period_start END
) + 1 AS days
FROM sales s) tmp
DAY, -- added
period_start,
CASE WHEN period_end > '2019-12-31' THEN '2019-12-31' ELSE period_end END
-- CASE WHEN period_start < '2019-01-01' THEN '2019-01-01' ELSE period_start END
) + 1 AS days
FROM #Sales s
WHERE DATEPART(YEAR, period_start) = 2019 -- added
) tmp
WHERE days > 0)
UNION ALL
(SELECT product_id,
Expand All @@ -67,13 +41,68 @@ FROM ((SELECT product_id,
FROM (SELECT product_id,
average_daily_sales,
DATEDIFF(
CASE WHEN period_end > '2020-12-31' THEN '2020-12-31' ELSE period_end END,
CASE WHEN period_start < '2020-01-01' THEN '2020-01-01' ELSE period_start END
DAY, -- added
period_start,-- added
CASE WHEN period_end > '2020-12-31' THEN '2020-12-31' ELSE period_end END
-- CASE WHEN period_start < '2020-01-01' THEN '2020-01-01' ELSE period_start END
) + 1 AS days
FROM #Sales s
WHERE DATEPART(YEAR, period_start) = 2020 -- added
) tmp
WHERE days > 0)
-- added this additional UNION
UNION ALL
(SELECT product_id,
'2019' AS report_year,
days * average_daily_sales AS total_amount
FROM (SELECT product_id,
average_daily_sales,
DATEDIFF(
DAY, -- added
'2019-01-01',-- added -- start_date
CASE WHEN period_end > '2018-12-31' AND period_end > '2019-12-31' THEN '2019-12-31' ELSE period_end END
) + 1 AS days
FROM #Sales s
WHERE DATEPART(YEAR, period_start) = 2018 -- added
AND DATEPART(YEAR, period_end) = 2020
) tmp
WHERE days > 0)
-- added this additional UNION
UNION ALL
(SELECT product_id,
'2020' AS report_year,
days * average_daily_sales AS total_amount
FROM (SELECT product_id,
average_daily_sales,
DATEDIFF(
DAY, -- added
'2020-01-01',-- added
period_end -- added
) + 1 AS days
FROM #Sales s
WHERE DATEPART(YEAR, period_start) = 2019 -- added
AND DATEPART(YEAR, period_end) = 2020
) tmp
WHERE days > 0)
-- added this additional UNION
UNION ALL
(SELECT product_id,
'2020' AS report_year,
days * average_daily_sales AS total_amount
FROM (SELECT product_id,
average_daily_sales,
DATEDIFF(
DAY, -- added
'2020-01-01',-- added
period_end -- added
) + 1 AS days
FROM sales s) tmp
FROM #Sales s
WHERE DATEPART(YEAR, period_start) = 2018 -- added
AND DATEPART(YEAR, period_end) = 2020 -- added
) tmp
WHERE days > 0)
) r
INNER JOIN product p
INNER JOIN #Product p
ON r.product_id = p.product_id
ORDER BY r.product_id,
report_year ;