使用不同的WHERE子句連接兩個表的數據

Question

我需要在兩個單獨的表上執行各種聯接/聯合，以將我的結果組合到一個表中。首先，我將分享我擁有的和我需要的，然後我將分享我目前的非工作解決方案。

我有什麼：

• 每個表由執行的操作的列表，每一個操作都有一個opPatient（所有患者有多個操作），opClassification（1，2，3或4）， opDate，opPrice。

• A Start和End查詢的日期。

我需要什麼：

產生單個表：

• 的所有不同opPatients
• 對於每一個病人的列表：
  • 總的所有操作opprice
  • 合計用的4分類的所有操作的（分級4僅在table2）
  • 所有操作總數
  • 操作的總數的3
  • 操作的總數的2
  一個分類的分類
• 上述所有WHERE opDate >= @StartDate AND opDate <= EndDate

當前解決方案的（顯然不工作）

• 設置start和end日期（這裏沒有錯誤）

  SET @StartDate = DATEADD(DAY, -(DATEPART(Day, @Date)-1), @Date);  
  SET @EndDate = DATEADD(DAY, -1, (DATEADD(MONTH, 1, @StartDate))); 
  
  SELECT 
      Operation = (SELECT DISTINCT operation FROM table1 
         UNION 
         SELECT DISTINCT operation FROM table2), 
      TotalPrice = CAST(opPrice) AS MONEY), 
      TotalOps = COUNT(*), 
      opC4 = COUNT(CASE 
        WHEN opClassification = 4 THEN 1 
        ELSE Null         
        END) 
        WHERE opDate <= @EndDate AND opDate >= @StartDate 
        FROM table2,    
      opC3 = COUNT (CASE WHEN opClassification = 3 THEN 1 ELSE Null END), 
      opC2 = COUNT (CASE WHEN opClassification = 2 THEN 1 ELSE Null END) 
  FROM 
      table1, table2 
  WHERE 
      table1.opDate <= @EndDate AND table1.opDate >= @StartDate 
  ORDER BY 
      Operation 
  

所有幫助，提示和指針將不勝感激！

謝謝！ 此致敬禮編碼器。

Answer 1

根據您的要求，似乎這是你所需要的。

SELECT opPatient 
, SUM(CASE WHEN opClassification = 1 THEN 1 ELSE 0 END) opC1 
, SUM(CASE WHEN opClassification = 2 THEN 1 ELSE 0 END) opC2 
, SUM(CASE WHEN opClassification = 3 THEN 1 ELSE 0 END) opC3 
, SUM(CASE WHEN opClassification = 4 THEN 1 ELSE 0 END) opC4 
, SUM(opPrice) AS TotalPrice 
FROM 
(
    SELECT * FROM Table1 
    UNION ALL 
    SELECT * FROM Table2 
) AS NewTable 
WHERE opDate >= @StartDate AND opDate <= @EndDate 
GROUP BY opPatient 

Answer 2

SET @StartDate = DATEADD(DAY, -(DATEPART(Day, @Date)-1), @Date); 
SET @EndDate = DATEADD(DAY, -1, (DATEADD(MONTH, 1, @StartDate))); 

SELECT opPatient, 
    -- Totals 
    COUNT(opPrice) AS OpsTotal, 
    SUM(opPrice) AS PriceTotal, 
    SUM(CASE WHEN opDate >= @StartDate AND opDate <= EndDate THEN opPrice END) AS PriceThisMonth, 
    -- Op 4 
    SUM(CASE WHEN opClassification = 4 THEN 1 END) AS OpsOp4, 
    SUM(CASE WHEN opClassification = 4 THEN opPrice END) AS PriceOp4, 
    SUM(CASE WHEN opClassification = 4 AND opDate >= @StartDate AND opDate <= EndDate THEN opPrice END) AS Op4PriceThisMonth, 
    -- Op 3 
    SUM(CASE WHEN opClassification = 3 THEN 1 END) AS OpsOp4, 
    SUM(CASE WHEN opClassification = 3 THEN opPrice END) AS PriceOp4, 
    SUM(CASE WHEN opClassification = 3 AND opDate >= @StartDate AND opDate <= EndDate THEN opPrice END) AS Op4PriceThisMonth, 
    -- Op 2 
    SUM(CASE WHEN opClassification = 2 THEN 1 END) AS OpsOp4, 
    SUM(CASE WHEN opClassification = 2 THEN opPrice END) AS PriceOp4, 
    SUM(CASE WHEN opClassification = 2 AND opDate >= @StartDate AND opDate <= EndDate THEN opPrice END) AS Op4PriceThisMonth, 

FROM (
    SELECT opPatient, opClassification, opDate, opPrice 
    FROM Table1 
    UNION ALL 
    SELECT opPatient, opClassification, opDate, opPrice 
    FROM Table1 
) 
GROUP BY opPatient