使用TSQL插入忽略重复项

我有一个在两列上具有唯一约束的表：

CREATE TABLE MIGRATION_DICTIONARIES.dbo._TableQueue_ (
    Id INT IDENTITY PRIMARY KEY,
    TableName VARCHAR(250),
    TableFrom VARCHAR(250),
    KeyName VARCHAR(250),
    Processed INT DEFAULT 0,

    CONSTRAINT [UQ_codes] UNIQUE NONCLUSTERED
    (
        TableName, TableFrom
    )
)

在我试图实现的过程中，我需要使用insert INTO（…）SELECT插入一组记录。现在，如何确保复制约束的任何行都将被忽略，但select语句给出的所有其他行仍将被保存

带insert的查询：

INSERT INTO MIGRATION_DICTIONARIES.dbo._TableQueue_ (TableName, TableFrom, KeyName)
SELECT 'some_table_name', t.name as TableWithForeignKey, c.name as ForeignKeyColumn 
from sys.foreign_key_columns as fk
inner join sys.tables as t on fk.parent_object_id = t.object_id
inner join sys.columns as c on fk.parent_object_id = c.object_id and fk.parent_column_id = c.column_id
where fk.referenced_object_id = (select object_id from sys.tables where name = 'some_table_name')

[编辑] 我以以下问题结束：

MERGE MIGRATION_DICTIONARIES.dbo._TableQueue_ AS T
USING (
    SELECT 'SomeTable' as TableFrom, t.name as TableWithForeignKey, c.name as ForeignKeyColumn 
    from sys.foreign_key_columns as fk
    inner join sys.tables as t on fk.parent_object_id = t.object_id
    inner join sys.columns as c on fk.parent_object_id = c.object_id and fk.parent_column_id = c.column_id
    where fk.referenced_object_id = (select object_id from sys.tables where name = 'SomeTable')
) AS S
ON (T.TableName = S.TableWithForeignKey AND T.TableFrom = S.TableFrom)
WHEN NOT MATCHED BY TARGET THEN
    INSERT (TableName, TableFrom, KeyName)
    VALUES (S.TableFrom, S.TableWithForeignKey, S.ForeignKeyColumn);

但当我运行它时，仍然会出现约束错误：

Violation of UNIQUE KEY constraint 'UQ_codes'. Cannot insert duplicate key in object 'dbo._TableQueue_'. The duplicate key value is (UP_Opiekun, UP_Uczen).
The statement has been terminated.

---

我做错了什么？

对于SQL Server 2008，您可以在语句中只插入一个“WHEN NOT MATCHED BY TARGET”子句。不要使用“匹配时”子句

更一般地说，您还可以使用

INSERT dbo._TableQueue_
   (....)
SELECT
   ...
FROM
   SOurce S
WHERE
   NOT EXISTS (SELECT *
      FROM dbo._TableQueue_ T
      WHERE
         S.TableName = T.TableName AND S.TableFrom = T.TableFrom
      )

评论后：

MERGE INTO dbo._TableQueue_ T
USING Source S
       ON S.TableName = T.TableName AND S.TableFrom = T.TableFrom
WHEN NOT MATCHED BY TARGET THEN
   INSERT (...)
   VALUES (S.x. S.y, ...);

---

请选择哪个版本的SQL Server？它将在2012年运行，因此使用匹配的解决方案可能会很有用。但是，如何使用merge代替insert-into-select语句？你能提供一些例子吗？嗯，当你有一个具体的源代码作为一个表时似乎很容易，但是更复杂的查询呢？我添加了需要在main post中使用的insert查询。您只需将源查询放入（）中，如我链接中的示例A所示。