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Editorial Team
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Asked: 2026-06-15T12:57:49+00:00

I have 2 equal databases (A and B) with one table each running in

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I have 2 equal databases (A and B) with one table each running in separate offline machines.

Every day I export their data (as csv) and “merge” it into a 3rd database (C). I first process A, then B (I insert the content from A to C, then the contents from B to C)

Now, it could happen that I get duplicate rows. I consider a duplicate if some field, for example “mail” already exists. I don’t care if the rest of the fields are the same.

How can I insert A and B into C excluding those rows that are duplicates?

Thanks in advance!

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1 Answer

  1. Editorial Team

    Easiest solution should be to create a unique index on the columns in question and run the second insert as INSERT IGNORE

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