Auto Increment Composite Key InnoDB

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I want to create a MyISAM like behavior for an InnoDB MySQL table. I want to have a composite primary key:

PRIMARY KEY(id1, id2)

Where id1 auto increments based on the value of id2. What's the best way to accomplish this with InnoDB?

+----------+-------------+--------------+
|      id1 |         id2 | other_column |
+----------+-------------+--------------+
|        1 |           1 | Foo          |
|        1 |           2 | Bar          |
|        1 |           3 | Bam          |
|        2 |           1 | Baz          |
|        2 |           2 | Zam          |
|        3 |           1 | Zoo          |
+----------+-------------+--------------+
1 Answers
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