SQL Server 2008 R2 - 查找select语句之间的差异

Question

如何根据同一个表找到两个select语句之间的差异？例如：

SELECT ID
FROM Table as TableA
WHERE Date = '2016-04-30'

根据上面的选择声明，我想找到所有不存在的ID：

SELECT ID
FROM Table as TableB
WHERE Date = '2016-03-31'

Answer 1

{{1}}

Answer 2

早期的答案很聪明。这是一种简单的方法。

Select ID from Table
where Date = '2016-04-30' 
and ID not in (select ID from Table where Date = '2016-03-31')