Dedupe
Identify duplicate records and delete or merge them
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The dedupe app allows you to identify duplicate records in your base and delete or merge them. Start by picking a table, a view (if desired), and one or more fields that will be used to determine which records should be considered duplicates. Once you're happy with your criteria, you can review and resolve sets of duplicates manually: delete unneeded records, preserve records that aren't actually duplicates, and merge individual fields from duplicate records.
For large bases, the dedupe extension may be slow to review, merge, and delete records.