Question

我有一个像这样的主表

Product    Status  Product id
A          True     1
B          True     2
C          true     3
D          True     4
E          false    5
F          True     6

现在我有其他表格给了我产品的依赖性

Product    DependencyId
C             2
C             5
E             1
B             4
B             6

现在，当我搜索C时，我可以看到两种产品依赖于C，现在这两种产品依赖于其他产品。

让我说我正在寻找E，然后我只有一个产品的依赖。

现在，我需要检查产品是否有任何依赖关系是假的。如果任何依赖项为false，那么我必须返回一些text / value。

结果

When product is C then output will be E (because the grand children of C (i.e. E) has false)

When product is B then output will be NULL (becuase none of the child of B or their sub childrens has false)

Answer 1

Declare @cnt int

Select * 
into #tmp
from mastera where Product_ID in (Select DependencyID from dbo.dependency where Product='C')

select @cnt=0
while @cnt<>(Select count(*) from #tmp)
begin 
    Select @cnt=count(*) from #tmp
    insert into #tmp
    Select m.* 
    from mastera m
    Left join  #tmp on m.Product=#tmp.Product 
    where m.Product_ID in (Select DependencyID from dbo.dependency where Product in (Select Product from #tmp where status=1))
    and #tmp.Product is null
end


Select * from #tmp  where Status=0

Drop table #tmp

Answer 2

这应该列出具有 false 状态的直接孩子。

SELECT  
    C.Product
FROM 
    MasterTable A
JOIN
    Dependency D ON D.Product = A.Product
JOIN
    MasterTable C ON C.ProductId = D.DependencyId AND C.Status = 0

SQL中对master和child的依赖

2 个答案: