SQL - Insert Where Not Already Exists

Struggling with my SQL again,

I am loading new data into tblPrices from tblPasteForLoad

The tblPrices table has a compound key consisting of   SupplierID and ProductCode.

INSERT INTO tblPrices (SupplierID, ProductCode)
SELECT SupplierID,ProductCode from tblPasteForLoad
tblPasteForLoad.SupplierID & tblPasteForLoad.ProductCode

Hopefully the above 5 lines of pseudo SQL will indicate the SQL I actually require.


Patrick O'DeaAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
this should do:
INSERT INTO tblPrices (SupplierID, ProductCode)
SELECT l.SupplierID, l.ProductCode 
 from tblPasteForLoad l
WHERE NOT EXISTS( SELECVT NULL FROM tblPrices p WHERE p.SupplierID = l.SupplierID AND p.ProductCode = l.ProductCode )

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If your compound key is 'unique' you can just use 'INSERT IGNORE':

INSERT IGNORE INTO tblPrices (SupplierID, ProductCode) VALUES ....

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Patrick O'DeaAuthor Commented:
Thanks Angel with 4 l's!

Just perfect!
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