Answer by ypercubeᵀᴹ for How to use 2 auto increment columns in MySQL phpmyadmin

No, you can't. Not out of the box. Possible workarounds:

1. Triggers (an AFTER INSERT trigger).

   Disadvantages:

   • Plain horror. Comes with all the other disadvantages of triggers, like maintenance and debugging nightmares.

   Advantages:

   • You can have FOREIGN KEY constraints that reference this column.
   • You can update the first and the second id columns individually.

2. Views. If you only a value that is always +4000400 of the first auto incremented value, you can use a view, so basically not store this value at all, just calculate it when you need it:

       CREATE VIEW         tablex_with_2nd_AI AS    SELECT         tablex_id,        colA,                                 -- other columns        --                                    -- you need        tablex_ix + 4000400  AS second_id    FROM         tablex ;

   Disadvantages:

   • You can't have a FOREIGN KEY constraint that references this (virtual) column.

   Advantages:

   • Saves some space. Slightly faster inserts.

3. Don't do that, don't have a second auto incremented column at all. Do you really need a second auto incremented value? What for? A description of the actual problem you are trying to solve would help others help you better. I think you have only told here how you tried to solve a problem and not what the actual problem is.