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Editorial Team
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Asked: 2026-05-18T00:06:35+00:00

For a project we do the database design at the moment. We think we

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For a project we do the database design at the moment. We think we should use two auto_increment fields in one table.

table master:

`pid` int(10) NOT NULL auto_increment,
`iid` int(10) NOT NULL auto_increment,
...

To start with a alternate auto_incremet you can use ALTER TABLE tbl AUTO_INCREMENT = 100000; This will work only for the whole table ‘tbl’.
auto_increment for pid should be 50000000 and auto_increment for iid should be 80000000

We want to avoid splitting it into 3 tables with relations master -> table.pid and master -> table.iid.

altering the table is not working cause
/* SQL Error (1075): Incorrect table definition; there can be only one auto column and it must be defined as a key */

Is it possible or what alternative do you recommend?

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1 Answer

  1. Editorial Team

    If you cannot use two auto columns I think you must redesign your database. What do you need exactly?

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