如何從表中刪除兩個不同表中的不相等記錄

Question

我有A，B，C三個不同的表，我需要刪除一個表中不存在的B和C表中的記錄。

樣品：

delete from A 
where name NOT IN (select name from B inner join C); 

Answer 1

我喜歡用左聯接像這樣的東西。我開始通過創建一個select語句是這樣的：

SELECT * 
FROM TableA AS a 
     LEFT OUTER JOIN TableB AS b ON a.Name = b.Name 
     LEFT OUTER JOIN TableC AS c ON a.Name = c.Name 
WHERE b.Name IS NULL 
     AND c.NAME IS NULL 

然後我轉換爲DELETE語句是這樣的：

DELETE a 
FROM TableA AS a 
     LEFT OUTER JOIN TableB AS b ON a.Name = b.Name 
     LEFT OUTER JOIN TableC AS c ON a.Name = c.Name 
WHERE b.Name IS NULL 
     AND c.NAME IS NULL