First commit, 已上架的電子書

2026-01-19 17:39:31 +08:00
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+這個 SQL Script 是針對 Jack 的飯店業 BI
+需要看到周變化，所以整理出來的 Script
+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
+
+
+/*
+  以年度共幾周為單位取日期區間(一年共 52 周)
+  以下內容是 ChatGPT 的結果，令人驚豔
+  
+  Michael 20250604
+*/
+
+SET DATEFIRST 7;  -- 設定週日為每週第一天
+
+WITH Weeks AS (
+    SELECT 
+        DATEADD(DAY, -(DATEPART(WEEKDAY, DATEFROMPARTS(2025, 1, 1)) - 1), DATEFROMPARTS(2025, 1, 1)) AS WeekStart
+    UNION ALL
+    SELECT 
+        DATEADD(WEEK, 1, WeekStart)
+    FROM Weeks
+    WHERE DATEADD(WEEK, 1, WeekStart) <= DATEFROMPARTS(2025, 12, 31)
+),
+WeeksWithMonth AS (
+    SELECT
+        ROW_NUMBER() OVER (ORDER BY WeekStart) AS WeekNumber,
+        WeekStart,
+        DATEADD(DAY, 6, WeekStart) AS EndDate,
+        MONTH(WeekStart) AS MonthNumber,
+        DATENAME(MONTH, WeekStart) AS MonthName,
+        YEAR(WeekStart) AS YearNumber
+    FROM Weeks
+    WHERE YEAR(WeekStart) = 2025 OR YEAR(DATEADD(DAY, 6, WeekStart)) = 2025
+),
+WeeksWithMonthRank AS (
+    SELECT *,
+        ROW_NUMBER() OVER (PARTITION BY YearNumber, MonthNumber ORDER BY WeekStart) AS WeekOfMonth
+    FROM WeeksWithMonth
+)
+SELECT
+    WeekNumber,
+    WeekStart AS StartDate,
+    EndDate,
+    MonthName,
+    MonthNumber,
+    WeekOfMonth  -- ?? 當月第幾週
+-- into Year_WeekData
+FROM WeeksWithMonthRank
+ORDER BY StartDate
+OPTION (MAXRECURSION 100)
+
+
+
+
+
+
+/*
+  以下的寫法會將跨月的周，拆成 2 筆
+  目的是如果要以月為單位看第幾周，就用下面的語法
+*/
+
+-- SET DATEFIRST 7;  -- 設定週日為一週的第一天（星期日）
+SET DATEFIRST 1;  -- 設定週一為一週的第一天（星期一）
+
+-- 產生所有週的開始日
+WITH Weeks AS (
+    SELECT 
+        DATEADD(DAY, -(DATEPART(WEEKDAY, DATEFROMPARTS(2025, 1, 1)) - 1), DATEFROMPARTS(2025, 1, 1)) AS WeekStart
+    UNION ALL
+    SELECT 
+        DATEADD(WEEK, 1, WeekStart)
+    FROM Weeks
+    WHERE DATEADD(WEEK, 1, WeekStart) <= DATEFROMPARTS(2025, 12, 31)
+),
+
+-- 加上 WeekNumber（全年第幾週）
+WeeksWithNumber AS (
+    SELECT 
+        ROW_NUMBER() OVER (ORDER BY WeekStart) AS WeekNumber,
+        WeekStart,
+        DATEADD(DAY, 6, WeekStart) AS WeekEnd
+    FROM Weeks
+),
+
+-- 將每週展開成7天
+DaysInWeek AS (
+    SELECT 
+        W.WeekNumber,
+        W.WeekStart,
+        DATEADD(DAY, N.number, W.WeekStart) AS DayDate
+    FROM WeeksWithNumber W
+    JOIN master.dbo.spt_values N ON N.type = 'P' AND N.number BETWEEN 0 AND 6
+    WHERE YEAR(DATEADD(DAY, N.number, W.WeekStart)) = 2025
+),
+
+-- 拆分週中涉及的每個月份的起訖日
+WeekMonthSplit AS (
+    SELECT
+        WeekNumber,
+        WeekStart,
+        MONTH(DayDate) AS MonthNumber,
+        DATENAME(MONTH, DayDate) AS MonthName,
+        YEAR(DayDate) AS YearNumber,
+        MIN(DayDate) AS StartDate,
+        MAX(DayDate) AS EndDate
+    FROM DaysInWeek
+    GROUP BY WeekNumber, WeekStart, MONTH(DayDate), DATENAME(MONTH, DayDate), YEAR(DayDate)
+),
+
+-- 加上「當月第幾週」
+FinalResult AS (
+    SELECT *,
+        ROW_NUMBER() OVER (PARTITION BY YearNumber, MonthNumber ORDER BY StartDate) AS WeekOfMonth
+    FROM WeekMonthSplit
+)
+
+-- 輸出最終結果
+SELECT
+    ROW_NUMBER() OVER (ORDER BY StartDate) AS RecordID,
+    WeekNumber,
+    WeekStart,
+    StartDate,
+    EndDate,
+    MonthName,
+    MonthNumber,
+    WeekOfMonth
+-- into Year_WeekData
+FROM FinalResult
+ORDER BY StartDate
+OPTION (MAXRECURSION 100)