unique records in append query

[nikos adamopoulos via AccessMonster.com]

I use an Append Query to copy data from one table to another but I want to copy only that data entries that are not already contained in the original table. How can I avoid copying data that already exists and thus having multiple entries in the final table?

 

[Brendan Reynolds]

INSERT INTO tblTarget ( TargetText )
SELECT tblSource.SourceText
FROM tblSource
WHERE (((tblSource.SourceID) Not In (SELECT TargetID FROM tblTarget)));

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