Question

我有一个很长的脚本，用于删除大量（超过100个）表中的某些特定数据，它看起来像这样：

...

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')

...

我想改变这一点，所以我不必更改每一行的变量，我希望能够在开头设置where语句，这将改变所有删除行

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

您需要表格变量。根据需要更改列名，数据类型：

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

另一个解决方案是在select语句上创建一个游标，并为每个结果实体运行带有适当变量的delete语句。

处理许多删除语句的更好方法

2 个答案: