ЛИТЬЯ вызывает ошибку во время Союзов

Question

я работаю на запрос:

DECLARE @userParam VARCHAR(100) 
    ,@startDateParam DATETIME 

SET @userParam = '' 
SET @startDateParam = '2013-09-02 00:00:00' 

SELECT '1' AS RowType 
    ,'Person' AS Person 
    ,'Project' AS Project 
    ,'Sprint' AS Sprint 
    ,'Story' AS Story 
    ,'Task' AS Task 
    ,(
     CASE 
      WHEN DATEPART(dw, @startDateParam) = 2 
       THEN 'Monday' 
      ELSE '' 
      END 
     ) AS Monday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 1, @startDateParam)) = 3 
       THEN 'Tuesday' 
      ELSE '' 
      END 
     ) AS Tuesday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 2, @startDateParam)) = 4 
       THEN 'Wednesday' 
      ELSE '' 
      END 
     ) AS Wednesday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 3, @startDateParam)) = 5 
       THEN 'Thursday' 
      ELSE '' 
      END 
     ) AS Thursday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 4, @startDateParam)) = 6 
       THEN 'Friday' 
      ELSE '' 
      END 
     ) AS Friday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 5, @startDateParam)) = 7 
       THEN 'Saturday' 
      ELSE '' 
      END 
     ) AS Saturday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 6, @startDateParam)) = 1 
       THEN 'Sunday' 
      ELSE '' 
      END 
     ) AS Sunday 
    ,'Total' AS Total 
-- 

UNION ALL 

-- 
SELECT '2' AS RowType 
    ,'' AS Person 
    ,'' AS Project 
    ,'' AS Sprint 
    ,'' AS Story 
    ,'' AS Task 
    ,(
     CASE 
      WHEN DATEPART(dw, @startDateParam) = 2 
       THEN CONVERT(VARCHAR(10), @startDateParam, 111) 
      ELSE '' 
      END 
     ) AS Monday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 1, @startDateParam)) = 3 
       THEN CONVERT(VARCHAR(10), DATEADD(DAY, 1, @startDateParam), 111) 
      ELSE '' 
      END 
     ) AS Tuesday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 2, @startDateParam)) = 4 
       THEN CONVERT(VARCHAR(10), DATEADD(DAY, 2, @startDateParam), 111) 
      ELSE '' 
      END 
     ) AS Wednesday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 3, @startDateParam)) = 5 
       THEN CONVERT(VARCHAR(10), DATEADD(DAY, 3, @startDateParam), 111) 
      ELSE '' 
      END 
     ) AS Thursday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 4, @startDateParam)) = 6 
       THEN CONVERT(VARCHAR(10), DATEADD(DAY, 4, @startDateParam), 111) 
      ELSE '' 
      END 
     ) AS Friday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 5, @startDateParam)) = 7 
       THEN CONVERT(VARCHAR(10), DATEADD(DAY, 5, @startDateParam), 111) 
      ELSE '' 
      END 
     ) AS Saturday 
    ,(
     CASE 
      WHEN DATEPART(dw, DATEADD(DAY, 6, @startDateParam)) = 1 
       THEN CONVERT(VARCHAR(10), DATEADD(DAY, 6, @startDateParam), 111) 
      ELSE '' 
      END 
     ) AS Sunday 
    ,'' AS Total 
-- 

UNION ALL 

-- 
SELECT '3' AS RowType 
    ,DTH.PointPerson AS Person 
    ,PDT.[Name] AS Project 
    ,(
     CASE 
      WHEN TSK.NAME IS NULL 
       THEN NULL 
      WHEN SPT.[Name] + ' - ' + SPT.[Description] IS NULL 
       THEN 'KanBan' 
      ELSE SPT.[Name] + ' - ' + SPT.[Description] 
      END 
     ) AS Sprint 
    ,COALESCE(STY.[Number], NSS.IncidentNumber) AS Story 
    ,TSK.[Name] AS Task 
    ,SUM(CASE 
      WHEN DATEPART(dw, DTH.ActivityDate) = 2 
       THEN DTH.[Hours] 
      ELSE 0 
      END) AS Monday 
    ,SUM(CASE 
      WHEN DATEPART(dw, DTH.ActivityDate) = 3 
       THEN DTH.[Hours] 
      ELSE 0 
      END) AS Tuesday 
    ,SUM(CASE 
      WHEN DATEPART(dw, DTH.ActivityDate) = 4 
       THEN DTH.[Hours] 
      ELSE 0 
      END) AS Wednesday 
    ,SUM(CASE 
      WHEN DATEPART(dw, DTH.ActivityDate) = 5 
       THEN DTH.[Hours] 
      ELSE 0 
      END) AS Thursday 
    ,SUM(CASE 
      WHEN DATEPART(dw, DTH.ActivityDate) = 6 
       THEN DTH.[Hours] 
      ELSE 0 
      END) AS Friday 
    ,SUM(CASE 
      WHEN DATEPART(dw, DTH.ActivityDate) = 7 
       THEN DTH.[Hours] 
      ELSE 0 
      END) AS Saturday 
    ,SUM(CASE 
      WHEN DATEPART(dw, DTH.ActivityDate) = 1 
       THEN DTH.[Hours] 
      ELSE 0 
      END) AS Sunday 
    ,SUM(DTH.[Hours]) AS Total 
FROM DailyTaskHours DTH 
LEFT JOIN Task TSK ON DTH.TaskId = TSK.PK_Task 
LEFT JOIN Story STY ON TSK.StoryId = STY.PK_Story 
LEFT JOIN NonScrumStory NSS ON DTH.NonScrumStoryId = NSS.PK_NonScrumStory 
LEFT JOIN Sprint SPT ON STY.SprintId = SPT.PK_Sprint 
LEFT JOIN Product PDT ON STY.ProductId = PDT.PK_Product 
GROUP BY DTH.PointPerson 
    ,PDT.[Name] 
    ,SPT.[Name] 
    ,SPT.[Description] 
    ,STY.[Number] 
    ,NSS.IncidentNumber 
    ,TSK.[Name] 
HAVING SUM(DTH.[Hours]) > 0 

СОЮЗ между 2-ым и 3-го блока вызывает проблемы.

В частности: Ошибка преобразования типа данных varchar в числовой.

Я вижу, где ошибка, в первых двух блоках столбцы с понедельника по пятницу являются varchar, а на последнем блоке они не являются.

Я попытался их литья:

SUM(CASE 
     WHEN DATEPART(dw, DTH.ActivityDate) = 2 
      THEN CAST (DTH.[Hours] AS VARCHAR(80)) 
     ELSE 0 
     END) AS Monday 

И я теперь получаю эту ошибку: Конверсия удалось при преобразовании значения VARCHAR «0.25» для типа данных междунар.

Я не понимаю, почему, насколько я могу видеть, что я не пытаюсь преобразовать 0.25 в целое Я пытаюсь преобразовать его в VARCHAR()

Как достичь желаемых результатов?

Answer 1

Ваша ELSE-часть в CASE возвращает числовое значение, которое приводит к числовому типу данных для возвращаемого значения. Вы должны переместить CAST вне SUM:

CAST(SUM(CASE 
     WHEN DATEPART(dw, DTH.ActivityDate) = 2 
      THEN DTH.[Hours] 
     ELSE 0 
     END) AS VARCHAR(80)) AS Monday 

Answer 2

попробовать это:

CAST (SUM(CASE 
       WHEN DATEPART(dw, DTH.ActivityDate) = 2 
       THEN DTH.[Hours] 
       ELSE 0 END) 
    AS VARCHAR(80)) AS Monday