UNION在存儲過程COUNT

Question

我正在創建一個存儲過程，它將根據輸入的時間返回開放式案例的結果 - 我想返回案例的計數，但是基於不同的辦公室。編輯我的代碼後，我也會重新說明我的問題不同 - 哪種方式最好是返回一個計數而不是我現在得到的實際結果。

以下是我的存儲過程：

SELECT C.CaseId 
FROM [Case] C 
WHERE C.DateCreated <= @BeginDate 
    AND C.CaseId NOT IN (SELECT CaseId FROM CaseStatusChange CSC WHERE CSC.DateClosed < @BeginDate) 

UNION 

-- Also need the cases that reopened and are currently open 
SELECT ReOpened.CaseId FROM 
(
       SELECT C.CaseId, MAX(CSC.DateReopened) AS DateReOpened 
       FROM [Case] C 
       INNER JOIN [CaseStatusChange] CSC ON C.CaseId = CSC.CaseId 
       WHERE CSC.DateReopened <= @BeginDate 
       GROUP BY C.CaseId 
) ReOpened 
WHERE ReOpened.CaseId NOT IN 
(
       SELECT CaseId FROM CaseStatusChange 
       WHERE CaseId = ReOpened.CaseId AND 
       CaseStatusChange.DateClosed BETWEEN ReOpened.DateReopened AND @BeginDate 
) 

Answer 1

更新：要包含OfficeId的要求：

SELECT OfficeId, SUM(CaseCount) 
FROM (
      SELECT COUNT(C.CaseId) AS CaseCount, 
        C.OfficeId 
      FROM [Case] C 
      WHERE C.DateCreated <= @BeginDate 
       AND C.CaseId NOT IN (SELECT CaseId FROM CaseStatusChange CSC WHERE CSC.DateClosed < @BeginDate) 
      GROUP BY C.OfficeId 

      UNION ALL 

      -- Also need the cases that reopened and are currently open 
      SELECT COUNT(ReOpened.CaseId) As CaseCount, 
        ReOpened.OfficeID 
      FROM 
       (
        SELECT C.CaseId, MAX(CSC.DateReopened) AS DateReOpened, C.OfficeId 
        FROM [Case] C 
        INNER JOIN [CaseStatusChange] CSC ON C.CaseId = CSC.CaseId 
        WHERE CSC.DateReopened <= @BeginDate 
        GROUP BY C.CaseId, C.OfficeID 
       ) ReOpened 
      WHERE ReOpened.CaseId NOT IN 
        (
         SELECT CaseId FROM CaseStatusChange 
         WHERE CaseId = ReOpened.CaseId AND 
         CaseStatusChange.DateClosed BETWEEN ReOpened.DateReopened AND @BeginDate 
        ) 
      GROUP BY OfficeID 
     ) AS OpenCasesCount 
GROUP BY OfficeId 

---

你需要用你的整個查詢的內部查詢，如下圖所示：

SELECT SUM(CaseCount) 
FROM (
      SELECT COUNT(C.CaseId) AS CaseCount 
      FROM [Case] C 
      WHERE C.DateCreated <= @BeginDate 
       AND C.CaseId NOT IN (SELECT CaseId FROM CaseStatusChange CSC WHERE CSC.DateClosed < @BeginDate) 

      UNION ALL 

      -- Also need the cases that reopened and are currently open 
      SELECT COUNT(ReOpened.CaseId) As CaseCount 
      FROM 
       (
        SELECT C.CaseId, MAX(CSC.DateReopened) AS DateReOpened 
        FROM [Case] C 
        INNER JOIN [CaseStatusChange] CSC ON C.CaseId = CSC.CaseId 
        WHERE CSC.DateReopened <= @BeginDate 
        GROUP BY C.CaseId 
       ) ReOpened 
      WHERE ReOpened.CaseId NOT IN 
        (
         SELECT CaseId FROM CaseStatusChange 
         WHERE CaseId = ReOpened.CaseId AND 
         CaseStatusChange.DateClosed BETWEEN ReOpened.DateReopened AND @BeginDate 
        ) 
     ) AS OpenCasesCount 

Answer 2

這意味着，列在名單SELECT的數量必須匹配。他們的數據類型也是如此。

像這樣：

select 
    col1, col2, col3 
from 
    t1 
union 
select 
    col1, col2, col3 
from 
    t2 

你的具體情況，你需要添加OfficeID和計數在第二SELECT列表。