Insert Data Form Xls

Hello,

I'm trying to make a query to insert data form xls file to my database and it's working

Here's my code

INSERT INTO MY_TABLE
SELECT SAP_NBR, PERIOD, ANSWER, OSAT, SCORE
FROM OpenDataSource( 'Microsoft.Jet.OLEDB.4.0',
'Data Source="C:
ipTMP_Aubrygsi_osat.xls";
User ID=Admin;Password=;Extended properties=Excel 8.0')...Sheet1$
WHERE SAP_NBR is not null
AND PERIOD is not null
AND ANSWER is not null
AND OSAT is not null
AND SCORE is not null


And I would like to verify if there no sap_nrb and period already the same in the database
so I add :
AND SAP_NBR not in MY_TABLE.SAP_NBR
AND PERIOD not in MY_TABLE.PERIOD

but it doesn't work

what's the correct syntax to make it work ???

Thanks a lot & merry Xmas... :)