如何限制MERGE语句中输出子句的操作?

Here's my query:

这是我的查询:

MERGE INTO [payments_orders] o USING (
    SELECT 1 AS [order_id], 50.00 AS [amount] UNION ALL 
    SELECT 2 AS [order_id], 50.00 AS [amount]
) AS t ([order_id], [amount]) 
ON o.[payment_id] = 4 AND o.[order_id] = t.[order_id] 
WHEN MATCHED THEN UPDATE SET o.[amount] = t.[amount] 
WHEN NOT MATCHED THEN INSERT ([payment_id], [order_id], [amount]) 
VALUES (4, t.[order_id], t.[amount]) 
WHEN NOT MATCHED BY SOURCE AND o.[payment_id] = 4 THEN DELETE 
OUTPUT $ACTION AS [action], [deleted].[order_id];
MERGE INTO [paymen