How to Check for Duplicates Before Inserting Into SQL. When you insert new records into an SQL database, you may run into issues where you accidentally overwrite records that are already present ...

If your source data is in Excel and has duplicates, run Power Query to remove those duplicates before running a Word mail merge.

Microsoft Power Query requires less specialized knowledge when trying to find duplicate records in a Microsoft Excel sheet.

Microsoft Excel is perhaps the most powerful spreadsheet application you can buy. But it also has some simple functions, like finding duplicates in data.