Auto_increment values in InnoDB?

Question

I\'ve been using InnoDB for a project, and relying on auto_increment. This is not a problem for most of the tables, but for tables with deletion, this might be an issue:

Answer 1

So you have two tables:

TableA

A_ID [PK]

and

TableB

B_ID [PK]

A_ID [FK, TableA.A_ID]

And in TableB, the value of A_ID is not unique? Or is there a value in TableB.A_ID that is not in TableA.A_ID?

If you need the value of TableB.A_ID to be unique, then you need to add a UNIQUE constraint to that column.

Or am I still missing something?