Now we need to change all duplicate values to null. In other words, after grouping by the first two fields (or one of them), only the first record in the group remains unchanged, and the first two ...

should not make duplicates. also the delete query should be one for all the chunked records and not for each record.

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Does your large spreadsheet contain lots of blank rows that serve no purpose? Don't waste time removing these empty rows manually! Instead, use this tip to ensure you don't miss any rows or ...

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