處理許多delete語句

Question

我有很長的腳本從表中的大量（超過100+）刪除某些特定的數據，它看起來像這樣更好的辦法：

...

Delete from Table_name WHERE Company not in ('Company1','Company2') 
Delete from Table_name WHERE Company not in ('Company1','Company2') 
Delete from Table_name WHERE Company not in ('Company1','Company2') 
Delete from Table_name WHERE Company not in ('Company1','Company2') 

...

我想改變這個，所以我不必改變每一行的變量，我希望能夠在開始時設置where語句，並且這將改變所有的刪除行

declare .....something something 
SELECT CompanyID 
FROM _Company 
WHERE Company in ('Company1','Company2') -- I want to change this where statement only 

Delete from Table_name WHERE Company not in (variable) 
Delete from Table_name WHERE Company not in (variable) 
Delete from Table_name WHERE Company not in (variable) 
Delete from Table_name WHERE Company not in (variable) 

Answer 1

你想要一個表變量。改變列名，數據類型爲必要的：

DECLARE @idsToKeep TABLE (CompanyID int); 

INSERT @idsToKeep 
SELECT CompanyID 
FROM _Company 
WHERE Company IN ('Company1','Company2'); -- change this one place 

DELETE Table_name1 WHERE CompanyID NOT IN (SELECT CompanyID FROM @idsToKeep); 
DELETE Table_name2 WHERE CompanyID NOT IN (SELECT CompanyID FROM @idsToKeep); 
DELETE Table_name3 WHERE CompanyID NOT IN (SELECT CompanyID FROM @idsToKeep); 
-- etc 

Answer 2

另一個解決方案是在select語句和每個結果實體運行適當的變量DELETE語句來創建一個遊標。