131 lines
3.2 KiB
Plaintext
131 lines
3.2 KiB
Plaintext
這個 SQL Script 是針對 Jack 的飯店業 BI
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需要看到周變化，所以整理出來的 Script
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BI 一般是看趨勢，理論上不會看到這麼細，但是要做當然是可以的
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/*
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以年度共幾周為單位取日期區間(一年共 52 周)
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以下內容是 ChatGPT 的結果，令人驚豔
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Michael 20250604
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*/
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SET DATEFIRST 7; -- 設定週日為每週第一天
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WITH Weeks AS (
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SELECT
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DATEADD(DAY, -(DATEPART(WEEKDAY, DATEFROMPARTS(2025, 1, 1)) - 1), DATEFROMPARTS(2025, 1, 1)) AS WeekStart
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UNION ALL
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SELECT
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DATEADD(WEEK, 1, WeekStart)
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FROM Weeks
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WHERE DATEADD(WEEK, 1, WeekStart) <= DATEFROMPARTS(2025, 12, 31)
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),
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WeeksWithMonth AS (
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SELECT
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ROW_NUMBER() OVER (ORDER BY WeekStart) AS WeekNumber,
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WeekStart,
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DATEADD(DAY, 6, WeekStart) AS EndDate,
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MONTH(WeekStart) AS MonthNumber,
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DATENAME(MONTH, WeekStart) AS MonthName,
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YEAR(WeekStart) AS YearNumber
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FROM Weeks
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WHERE YEAR(WeekStart) = 2025 OR YEAR(DATEADD(DAY, 6, WeekStart)) = 2025
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),
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WeeksWithMonthRank AS (
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SELECT *,
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ROW_NUMBER() OVER (PARTITION BY YearNumber, MonthNumber ORDER BY WeekStart) AS WeekOfMonth
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FROM WeeksWithMonth
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)
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SELECT
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WeekNumber,
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WeekStart AS StartDate,
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EndDate,
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MonthName,
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MonthNumber,
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WeekOfMonth -- ?? 當月第幾週
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-- into Year_WeekData
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FROM WeeksWithMonthRank
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ORDER BY StartDate
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OPTION (MAXRECURSION 100)
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/*
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以下的寫法會將跨月的周，拆成 2 筆
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目的是如果要以月為單位看第幾周，就用下面的語法
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*/
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-- SET DATEFIRST 7; -- 設定週日為一週的第一天（星期日）
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SET DATEFIRST 1; -- 設定週一為一週的第一天（星期一）
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-- 產生所有週的開始日
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WITH Weeks AS (
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SELECT
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DATEADD(DAY, -(DATEPART(WEEKDAY, DATEFROMPARTS(2025, 1, 1)) - 1), DATEFROMPARTS(2025, 1, 1)) AS WeekStart
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UNION ALL
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SELECT
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DATEADD(WEEK, 1, WeekStart)
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FROM Weeks
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WHERE DATEADD(WEEK, 1, WeekStart) <= DATEFROMPARTS(2025, 12, 31)
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),
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-- 加上 WeekNumber（全年第幾週）
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WeeksWithNumber AS (
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SELECT
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ROW_NUMBER() OVER (ORDER BY WeekStart) AS WeekNumber,
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WeekStart,
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DATEADD(DAY, 6, WeekStart) AS WeekEnd
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FROM Weeks
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),
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-- 將每週展開成7天
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DaysInWeek AS (
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SELECT
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W.WeekNumber,
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W.WeekStart,
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DATEADD(DAY, N.number, W.WeekStart) AS DayDate
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FROM WeeksWithNumber W
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JOIN master.dbo.spt_values N ON N.type = 'P' AND N.number BETWEEN 0 AND 6
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WHERE YEAR(DATEADD(DAY, N.number, W.WeekStart)) = 2025
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),
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-- 拆分週中涉及的每個月份的起訖日
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WeekMonthSplit AS (
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SELECT
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WeekNumber,
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WeekStart,
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MONTH(DayDate) AS MonthNumber,
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DATENAME(MONTH, DayDate) AS MonthName,
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YEAR(DayDate) AS YearNumber,
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MIN(DayDate) AS StartDate,
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MAX(DayDate) AS EndDate
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FROM DaysInWeek
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GROUP BY WeekNumber, WeekStart, MONTH(DayDate), DATENAME(MONTH, DayDate), YEAR(DayDate)
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),
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-- 加上「當月第幾週」
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FinalResult AS (
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SELECT *,
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ROW_NUMBER() OVER (PARTITION BY YearNumber, MonthNumber ORDER BY StartDate) AS WeekOfMonth
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FROM WeekMonthSplit
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)
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-- 輸出最終結果
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SELECT
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ROW_NUMBER() OVER (ORDER BY StartDate) AS RecordID,
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WeekNumber,
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WeekStart,
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StartDate,
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EndDate,
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MonthName,
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MonthNumber,
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WeekOfMonth
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-- into Year_WeekData
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FROM FinalResult
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ORDER BY StartDate
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OPTION (MAXRECURSION 100)
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