检查表中的重复日期以及SQL Server中的日期间隔

Question

我有一个具有以下结构的表：

ProductId | ValidFrom | ValidTo | Price

然而，似乎我对同一个ProductId有一些重叠的ValidFrom和ValidTo Dates。

如何创建输出的查询：

ProductId | Overlapping Dates

Answer 1

SELECT DISTINCT ProductId,  a.ValidFrom , b.ValidTo FROM 
yourTable a
JOIN yourTable b ON a. ValidFrom BETWEEN b.ValidFrom AND b.ValidTo 
OR a. ValidTo BETWEEN b.ValidFrom AND b.ValidTo 

Answer 2

好的，我使用您的回复到达那里。 但是我根据productId和日期为每一行创建了一个Key。 我只显示不相同的行。

SELECT DISTINCT ProductId,  a.ValidFrom , b.ValidTo FROM 
yourTable a
JOIN yourTable b ON a. ValidFrom BETWEEN b.ValidFrom AND b.ValidTo 
OR a. ValidTo BETWEEN b.ValidFrom AND b.ValidTo 
AND 
(cast(T1.ProductId as nvarchar(50) + Cast(T1.ValidFrom as nvarchar(50)) + Cast(T1.ValidTo        as nvarchar(50)))
<>
(cast(T2.ProductId as nvarchar(50) + Cast(T2.ValidFrom as nvarchar(50)) + Cast(T2.ValidTo     as nvarchar(50)))