• Saturday , 21 October 2017

MySQL Tutorial 1 – Remove Duplicate Rows from MySQL Table

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How to remove duplicate rows from a MySQL database table. The process should be similar for other kinds of databases I imagine. Have a wonderful day and …

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8 Comments

  1. Daniel Bachmann
    September 23, 2017 at 10:43

    Thanks for giving me the right idea. However I had a table with one column that I needed unique/primary and really many additional columns. I copied the structure to a new table, made the one column primary and used:
    INSERT IGNORE INTO <new_table> SELECT * FROM <old_table>
    to not have to declare the whole columns (159 total, this wasn't my design).

    Maybee someone can use this.

  2. Quy Nguyen
    September 23, 2017 at 10:43

    Perfect! Thank u so much !!!

  3. Pourya Da
    September 23, 2017 at 10:43

    This is exactly what I was looking for. Thank you

  4. test
    September 23, 2017 at 10:43

    It doesn't delete duplicate rows!!!!! It deletes rows based on distinct port_code!!!! The distinct function takes only the first attribute from the list which in your case is the port_code and it does not check for the rest of the columns.

  5. wieszcpj
    September 23, 2017 at 10:43

    of course you are only going to get that 45454 or what ever number it was. you failed to open the original table back up but instead went to port codes2 table and copied that right over. so you might want to redo your video so at least you are showing the right thing on the screen when you do this.

    thanks

  6. Anthony Vipond
    September 23, 2017 at 10:43

    of course it gets rid of them bud, once you have a table with unique rows, you can drop the other tables 🙂

  7. stevedawg85
    September 23, 2017 at 10:43

    so this doesn't actually delete them? it just moves them to a dummy unused table by taking them out?

  8. robert johnson
    September 23, 2017 at 10:43

    rock onnnnnnnnnnn

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