結合多個SELECT功能，其中兩個都有一個WHERE

Question

我試圖規範化我的數據，因爲它是從Excel工作表中輸入的。我提取數據的文件有多個列sibling1_name，sibling1_age，sibling1_affected等，最多有4個兄弟姐妹，4個孩子，4個親戚等等。我想將它們全部輸入到一個名稱，年齡，受影響和關係的新表中。我找到了一種方法來正確輸入第一個兄弟（見下文），但我不確定如何添加其他人。任何建議？

INSERT INTO Family 
      (ID, 
      Name, 
      Age, 
      Affected, 
      Relationship) 
SELECT ExcelPatients.id, 
     ExcelPatients.sibling1_name  AS Name, 
     ExcelPatients.sibling1_age  AS Age, 
     ExcelPatients.sibling1_affected AS Affected, 
     "Sibling" 
FROM ExcelPatients 
WHERE (((ExcelPatients.Sibling1_name) IS NOT NULL)) 
     AND ExcelPatients.id NOT IN (SELECT DISTINCT ID AND Name 
            FROM Family); 

Answer 1

INSERT INTO Family 
      (ID, 
      Name, 
      Age, 
      Affected, 
      Relationship) 

SELECoT ExcelPatients.id, ExcelPatients.sibling1_name AS Name, 
ExcelPatients.sibling1_age AS Age, 
ExcelPatients.sibling1_affected AS Affected, "Sibling" 
FROM ExcelPatients 
WHERE (((ExcelPatients.Sibling1_name) Is Not Null)) 
AND NOT EXISTS (SELECT DISTINCT ID FROM Family where family.id = ExcelPatients.id and Family.name = ExcelPatients.sibling1_name) 

UNION 

SELECT ExcelPatients.id, ExcelPatients.sibling2_name AS Name, 
ExcelPatients.sibling2_age AS Age, 
ExcelPatients.sibling2_affected AS Affected, "Sibling" 
FROM ExcelPatients 
WHERE (((ExcelPatients.Sibling2_name) Is Not Null)) 
AND NOT EXISTS (SELECT DISTINCT ID FROM Family where family.id = ExcelPatients.id and Family.name = ExcelPatients.sibling2_name) 

UNION 

SELECT ExcelPatients.id, ExcelPatients.sibling3_name AS Name, 
ExcelPatients.sibling3_age AS Age, 
ExcelPatients.sibling3_affected AS Affected, "Sibling" 
FROM ExcelPatients 
WHERE (((ExcelPatients.Sibling3_name) Is Not Null)) 
AND NOT EXISTS (SELECT DISTINCT ID FROM Family where family.id = ExcelPatients.id and Family.name = ExcelPatients.sibling3_name) 

UNION 

SELECT ExcelPatients.id, ExcelPatients.sibling4_name AS Name, 
ExcelPatients.sibling4_age AS Age, 
ExcelPatients.sibling4_affected AS Affected, "Sibling" 
FROM ExcelPatients 
WHERE (((ExcelPatients.Sibling4_name) Is Not Null)) 
AND NOT EXISTS (SELECT DISTINCT ID FROM Family where family.id = ExcelPatients.id and Family.name = ExcelPatients.sibling4_name) 

在沒有看到數據，我不知道，如果UNION ALL或聯合是正確的選擇。如果一個名字只能在四個兄弟列中的一箇中，那麼使用UNION ALL，如果它可以重複，則使用UNION。由於您正在清理其他來源的數據，UNION可能會更安全但速度更慢。不存在往往是SQL Server中最快的比較，這就是我選擇它的原因。