Merge 获取插入&；使用外部查询插入更新合并$Action的计数-SQL server 问题

如何从Merge$Action获取插入和更新的总数？？？，我需要记录插入和更新计数

--Inserting a new record for updates    
    Insert dbo.DestinationTable
    (
    CustomerID,
    CustomerName,
    IscurrentFlag
    )       
    select 
    CustomerID,
    CustomerName,
    IscurrentFlag
    from         
    (               
    --Inserting a new record for inserts        
    MERGE dbo.DestinationTable as dt
    USING dbo.SourceTable as src
    ON dt.CustomerID=src.CustomerID

    WHEN NOT MATCHED THEN INSERT 
    (CustomerID,CustomerName,IscurrentFlag) 
    values (src.CustomerID,src.CustomerName,'Y')

    WHEN MATCHED 
       THEN UPDATE  
       SET dt.IscurrentFlag ='N'

    OUTPUT src.*, $Action as MergeAction         
    ) as mrg

    WHERE MergeAction = 'UPDATE'

业务限制：我们无法分离外部插入功能，我知道我们可以使用临时表将所有输出加载到其中，获取计数并执行外部插入。

可能的重复

   I tried using multiple outputs inside merge but getting an error

 "An OUTPUT INTO clause is not allowed in a nested INSERT, UPDATE, DELETE, or MERGE statement"

    OUTPUT  $Action as counts into @Temp 
    OUTPUT src.*, $Action as MergeAction