mysql structure double unique

Question

I am trying to make a mysql table and have got stuck with making it.

2 columns required:

aid
bid

The trick is aid is not unique and bid is not unique, but the combination of aid-bid IS unique.

EG:

a b ok?
0 1 y
0 2 y
0 7 y
1 1 y
1 7 y
8 3 y
0 7 N - since 0 7 is already in table...

How can I make this table in sql so it works?

Answer 1

create table my_table (
a int,
b int,
unique key (a,b) );