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Editorial Team
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Asked: 2026-05-20T19:49:24+00:00

Let’s say I have a table, category , which has 3 columns, id ,

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Let’s say I have a table, category, which has 3 columns, id, parent_id and name.

I have several tables like this, and I want to consolidate them into one. At present, their IDs will clash (not unique across DBs) so I need to re-ID them. If I make id an auto_increment I can copy all the other columns over just fine, but then parent_id won’t link up properly anymore. Is there some magical way I can get the parent_id to point to the correct new ID?

Looking for something like

INSERT INTO newtable (parent_id, name) SELECT ???, name FROM oldtable
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1 Answer

  1. Editorial Team

    I imagine you could add an old_id column so that you’ll still have the original id and you can run successive updates to the table to modify all the parent_ids to point to the new auto_inc ids. You would obviously have to kill any foreign keys requirements on the table first and reinstitute them after all the changes were made – Patrick

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