即使没有数据也显示一年中的每个星期答案

【问题标题】：Show every week of the Year even if there is no data即使没有数据也显示一年中的每个星期
【发布时间】：2020-04-16 22:29:52
【问题描述】：

我有按周提取数据并将其组合在一起的查询。但我不显示没有任何数据的周。即使他们没有数据为空，我也想显示所有星期

如果有人可以帮我解决这个问题，那就太棒了

SELECT 
    DATEADD (week, datediff(week, 0, StartDate), -1) as 'WeekOf'
   ,DATEADD (week, datediff(week, 0, StartDate), +5) as 'to'
   ,DATEPART(wk, StartDate) as 'WeekNumber'

FROM [DESOutage].[dbo].[OPSInterruption]

Where  StartDate > '2020-01-01' and EndDate <'2020-02-01' 

Group by DATEADD (week, datediff(week, 0, StartDate), -1),DATEPART(wk, StartDate),DATEADD (week, datediff(week, 0, StartDate), +5)

***************输出*************** 如您所见，由于没有返回数据，因此缺少第 2 周和第 4 周。我仍然希望在输出中看到第 2 周和第 4 周，结果可能为 0。

WeekOf 到 WeekNumber 2019-12-29 00:00:00.000 2020-01-04 00:00:00.000 1 2020-01-12 00:00:00.000 2020-01-18 00:00:00.000 3 2020-01-26 00:00:00.000 2020-02-01 00:00:00.000 5

【问题讨论】：

您可能还需要>= 与StartDate 进行比较。
这能回答你的问题吗？ SHOW ALL Dates data between two dates; if no row exists for particular date then show zero in all columns
这里（和其他地方）已经被反复询问和回答。建议的链接显示了几种方法，但简短的回答是，您需要从日历表、数字表或 CTE 或子查询生成要加入的日期列表临时基础。

标签： tsql

【解决方案1】：

您可能需要一个日历表。这是一种生成方法的快速方法，其中包含未经测试的代码实现。我假设 StartDate 可能包含时间组件，因此需要合并日期。

DECLARE @StartYear DATETIME = '20200101'
DECLARE @days      INT      = 366

;WITH
  E1(N) AS (
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
  ),                                   -- 1*10^1 or 10 rows
  E2(N) AS (SELECT 1 FROM E1 a, E1 b), -- 1*10^2 or 100 rows
  E4(N) AS (SELECT 1 FROM E2 a, E2 b), -- 1*10^4 or 10,000 rows
  E8(N) AS (SELECT 1 FROM E4 a, E4 b), -- 1*10^8 or 100,000,000 rows
  Tally(N) AS (SELECT TOP (@Days) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E8),
  Calendar AS (
    SELECT  StartOfDay = DATEADD(dd,N-1,@StartYear),
            EndOfDay   = DATEADD(second, -1, DATEADD(dd,N  ,@StartYear))
    FROM Tally)

SELECT  DATEADD (week, datediff(week, 0, COALESCE(x.StartDate, c.StartOfDay) ), -1) as 'WeekOf'
      , DATEADD (week, datediff(week, 0, COALESCE(x.StartDate, c.StartOfDay)), +5) as 'to'
      , DATEPART(wk, COALESCE(x.StartDate, c.StartOfDay)) as 'WeekNumber'
FROM    Calendar c
        INNER JOIN [DESOutage].[dbo].[OPSInterruption] x
                ON x.StartDate > c.StartOfDay AND x.StartDate <= c.EndOfDay
WHERE   c.StartOfDay > '2020-01-01' AND c.StartOfDay <'2020-02-01' 
GROUP BY DATEADD (week, datediff(week, 0, COALESCE(x.StartDate, c.StartOfDay)), -1),
         DATEPART(wk, COALESCE(x.StartDate, c.StartOfDay)),
         DATEADD (week, datediff(week, 0, COALESCE(x.StartDate, c.StartOfDay)), +5)

【讨论】：