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Editorial Team
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Asked: 2026-05-25T10:16:35+00:00

I have 511 duplicates in my table, I need to delete these, but not

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I have 511 duplicates in my table, I need to delete these, but not the originals. Therefore I want to delete every second occurrence of every duplicate.

How can I do this?

TABLE:

code  /   status  /   time
E3F4FF928A  /  0 /
07D95444BB  /  0 /  
07D95444BB /   0 / 
40006C128F  / 0  / 1315293012
2B45790E52   /  0  /
40006C128F  / 0  / 1315293012
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1 Answer

  1. Editorial Team

    add a unique index to the table on the column that should be unique, and ignore errors

    alter ignore table X add unique index (column_a)

    http://dev.mysql.com/doc/refman/5.1/en/alter-table.html

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