MERGE語句的問題

Question

我有一個表[ExistingTable]有三列：ID，Value和Date

+----+------------------+ 
| ID | Value | Date  | 
+----+------------------+ 
| 1 | 100 |2016-01-01| 
| 1 | 200 |2016-01-01| 
| 1 | 300 |2016-01-01| 
| 2 | 200 |2016-01-01| 
| 2 | 300 |2016-01-01| 
+----+------------------+ 

，第二個表，[NewTable]

+----+------------+ 
| ID | Value  | 
+----+------------+ 
| 1 | 100  | 
| 1 | 200  | 
| 1 | 400  | 
| 2 | 200  | 
| 2 | 300  | 
+----+------------+ 

如果我寫這樣的合併聲明：

MERGE [ExistingTable] AS T1 
USING [NewTable] AS T2 ON (T1.[ID] = T2.[ID] AND T1.[Value] = T2.[Value]) 

WHEN NOT MATCHED THEN 
    INSERT([ID], [Value], [Date]) 
    VALUES(T2.[ID], T2.[Value], Getdate()) 

WHEN MATCHED THEN 
    UPDATE SET [Date] = Getdate(); 

查詢將插入ID = 1 AND Value = 400，它將更新所有其餘數據的日期。

但，我要讓INSERT所有ID字段值，尚未匹配，在這個例子中，我希望得到這種結果：

+----+------------------+ 
| ID | Value | Date  | 
+----+------------------+ 
| 1 | 100 |2016-01-01| 
| 1 | 200 |2016-01-01| 
| 1 | 300 |2016-01-01| 
| 2 | 200 |2016-10-15| 
| 2 | 300 |2016-10-15| 
| 1 | 100 |2016-10-15| 
| 1 | 200 |2016-10-15| 
| 1 | 400 |2016-10-15| 
+----+------------------+ 

它是可以實現的與MERGE聲明？

Answer 1

我想這可能是與CTE和INSERT來完成：

;WITH cte AS (--here we will store all ID's that have 1 and more not matched Values 
SELECT n.ID 
FROM [NewTable] n 
LEFT JOIN ExistingTable e 
    ON n.ID = e.id and n.[Value] = e.[Value] 
WHERE e.ID IS NULL 
) 

INSERT INTO ExistingTable 
SELECT n.ID, 
     n.[Value], 
     GETDATE() 
FROM [NewTable] n 
INNER JOIN cte c 
    ON c.ID = n.ID 

然後如果從ExistingTable選擇您將獲得：

ID Value Date 
1 100  2016-01-01 
1 200  2016-01-01 
1 300  2016-01-01 
2 200  2016-01-01 
2 300  2016-01-01 
1 100  2016-10-15 
1 200  2016-10-15 
1 400  2016-10-15