select top 0 * into #tmpdatabase from ABTABLE;
select * from #tmpdatabase;
BULK INSERT #tmpdatabase FROM $fileupload WITH (FIELDTERMINATOR =';',ROWTERMINATOR ='\n' ,FIRSTROW = 2);
MERGE ABTABLE AS T
USING #tmpdatabase AS S
ON (T.A = S.A)
WHEN NOT MATCHED BY TARGET
THEN INSERT(...