Append if Record Doesnt Exist, Else Update (1 Viewer)

proballin

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Feb 18, 2008
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I have a table that is filled based on selections that a user makes in combo boxes on a form. I am having trouble trying to figure out the best way to prevent duplicates from being inserted in the table when I do the append query part.

Since the table is filled based on the various selections the user makes I dont have a primary key or unique field.

Can someone help me figure out the best way to do this append/update queries to prevent duplicates. Also if you have a strategy for setting up some sort of unique or primary key for fields that could all be the same yet in the table only 1 record will show, no duplicates.
 

neileg

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Dec 4, 2002
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You could use DCount() to count the number of matching records in the table. If the count is anything other than 0, don't append.
 

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