SQL 服务器合并删除与过滤器

Question

我正在使用合并进行插入或删除，但我不确定它应该是什么样子。我有一个映射表，将分类法映射到支持的语言。该表如下所示：

TaxonomyLanguageID(PK) | TaxonomyID(FK) | LanguageID(FK)

我想要做的是将临时表与上表合并，其中临时表将包含分类法支持的语言列表。例如：

TaxonomyID|LanguageID

456,        2

456,        3

456,        9

我尝试过的看起来像这样（选择用于测试，稍后这将是一个临时表）：

MERGE dbo.TaxonomyLanguages as t
using (SELECT 5395  as TaxonomyID, 2 as LanguageID) as s
ON (s.TaxonomyID=T.TaxonomyID AND s.LanguageID=t.LanguageID)
WHEN NOT MATCHED BY TARGET THEN
    INSERT(TaxonomyID,LanguageID) VALUES(S.TaxonomyID,s.LanguageID)
WHEN NOT MATCHED BY SOURCE AND T.TaxonomyID=s.TaxonomyID
    THEN DELETE;

我想要做的是如果不匹配则插入，如果不匹配则删除，但只删除目标中与源中找到的分类 ID 匹配的那些行。

但我得到一个“只有目标列在'当源不匹配'子句中允许”错误。

关于如何解决这个问题（或应该如何完成）的任何想法？

我正在寻找的示例。如果我有来源喜欢

TaxonomyID|LanguageID

4000,      2

4000,      3

还有一个像这样的目标：

TaxonomyLanguageID|TaxonomyID|LanguageID

1,                  3000       2

2,                  4000       1

3,                  4000       2

最终结果是：

TaxonomyLanguageID|TaxonomyID|LanguageID

1,                 3000       2

3,                 4000       2

4,                 4000       3

Answer 1

你必须把它分成两遍，因为关键字段的数量不同。

Select 456 as TaxonomyID, 2 as LanguageID
  into TaxonomyLanguages

INSERT INTO [dbo].[TaxonomyLanguages]
           ([TaxonomyID]
           ,[LanguageID])
     VALUES
           (456, 3)
           ,(456, 9)
GO

select *
from [TaxonomyLanguages]


MERGE dbo.TaxonomyLanguages as t
using (SELECT 5395  as TaxonomyID, 2 as LanguageID) as s
ON (s.TaxonomyID=T.TaxonomyID AND s.LanguageID=t.LanguageID)
WHEN NOT MATCHED BY TARGET THEN
    INSERT(TaxonomyID,LanguageID) VALUES(S.TaxonomyID,s.LanguageID);


MERGE dbo.TaxonomyLanguages as t
using (SELECT 5395  as TaxonomyID, 2 as LanguageID) as s
ON (s.TaxonomyID=T.TaxonomyID)
WHEN NOT MATCHED BY SOURCE 
    THEN DELETE;

select *
from [TaxonomyLanguages]

根据评论，更改第二次合并：

MERGE dbo.TaxonomyLanguages as t
using (SELECT 456  as TaxonomyID, 3 as LanguageID) as s
ON (s.TaxonomyID=T.TaxonomyID)
WHEN  MATCHED 
  and (s.LanguageID <> T.LanguageID)
    THEN DELETE;

Answer 2

MERGE SupplierProducts with (HOLDLOCK) AS TARGET
USING (SELECT P.Id, P.ListPrice, P.SalesPrice FROM Products P) AS SOURCE ON (TARGET.Id = SOURCE.Id)

WHEN MATCHED AND TARGET.Id = SOURCE.Id THEN
    UPDATE SET TARGET.ListPrice = SOURCE.ListPrice,
               TARGET.Price = SOURCE.SalesPrice,
               TARGET.UpdatedAt = GETDATE()

WHEN NOT MATCHED BY TARGET THEN
    INSERT (ProductId, ListPrice, Price)
    VALUES (SOURCE.Id, SOURCE.ListPrice, SOURCE.SalesPrice)
    
WHEN NOT MATCHED BY SOURCE
    THEN DELETE
    OUTPUT
        left($action, 1) AS [Event],
        SOURCE.Id,
        DELETED.ListPrice AS OldListPrice,
        DELETED.Price AS OldPrice,
        INSERTED.ListPrice AS ListPrice,
        INSERTED.Price AS Price ,
        INSERTED.UpdatedAt;