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Deleting Duplicates

John Mark Osborne


Database administrators have nightmares about duplicate data entry. There are tons of solutions out there. Which direction do you go? Do you try to prevent duplicate record entry with validation or scripting? Do you let the duplicates get entered and delete the periodically? And, what about merging two records? Maybe it's not a nightmare but at least it's an issue you have to address before allowing users to enter data. This article will discuss the ins and outs of the various methods for deleting duplicates, followed by another article discussing how to prevent them from being entered in the first place.

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