MERGE
is atomic meaning that either all changes are committed or all changes are rolled back.
It does not prevent duplicate keys in case of high concurrency. Adding holdlock
hint will take care of that.
MERGE INTO CustomerSpend WITH (HOLDLOCK) AS T
USING ( SELECT ? AS ID, ? AS NetValue, ? AS VoidValue ) AS V
ON T.ID = V.ID
WHEN MATCHED THEN
UPDATE SET T.ID = V.ID, T.NetValue = T.NetValue + V.NetValue, T.VoidValue = T.VoidValue + V.VoidValue
WHEN NOT MATCHED THEN
INSERT ( ID,NetValue,VoidValue ) VALUES ( V.ID, V.NetValue, V.VoidValue );