Current flag on merge statement T-SQL

Question

Hi there,
I was using Type 2 for one of our Fact table.... and need to put a flag to know which one is the Current record...
I couldnt able to figure how to implement logic in the merge statement... Can anyone guide me please
this is an example Query ....I was using like this for my fact table...
Basically I need to track CustomerName and City... So I need a Currentflag (Y) for latest record....
MERGE INTO [dbo].[TargetCustomer] AS TRG
USING [dbo].[MyCustomers] AS SRC
ON TRG.[CustomerID] = SRC.[CustomerID]
AND TRG.[CustomerName]=SRC.[CustomerName]
AND TRG.[City]=SRC.[City]
WHEN MATCHED THEN
UPDATE SET
TRG.[Province]=SRC.[Province]
-- TRG.[Current Flag] = 'N'
WHEN NOT MATCHED THEN
INSERT ([CustomerID]
,[CustomerName]
,[City]
,[Province]
,[LastUpdate]
,[Current Flag]
VALUES (
[CustomerID]
,[CustomerName]
,[City]
,[Province]
,[LastUpdate]
,'Y'

Answer 1

it should be like this
INSERT INTO [dbo].TargetCustomer
[CustomerID]
,[CustomerName]
,[City]
,[Province]
,[LastUpdate]
,[Current Flag]
SELECT
[CustomerID]
,[CustomerName]
,[City]
,[Province]
,[LastUpdate]
,'Y'
FROM
MERGE INTO [dbo].[TargetCustomer] AS TRG
USING [dbo].[MyCustomers] AS SRC
ON TRG.[CustomerID] = SRC.[CustomerID]
AND TRG.[CustomerName]=SRC.[CustomerName]
AND TRG.[City]=SRC.[City]
WHEN MATCHED THEN
UPDATE SET
LastUpdate = GETDATE(),
TRG.[Current Flag] = 'N'
WHEN NOT MATCHED THEN
INSERT ([CustomerID]
,[CustomerName]
,[City]
,[Province]
,[LastUpdate]
,[Current Flag]
VALUES (
[CustomerID]
,[CustomerName]
,[City]
,[Province]
,[LastUpdate]
,'Y'
OUTPUT $Action AS Action,
SRC.CustomerID,
SRC.[CustomerName],
SRC.[City],
SRC.[Province],
SRC.[LastUpdate]
)AS t
[CustomerID]
,[CustomerName]
,[City]
,[Province]
,[LastUpdate]
WHERE Action = 'UPDATE';
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