>
> CREATE TABLE items (
> id INT,
> typ INT ...
> PRIMAY KEY (seq,typ));
>
> id typ
> ----+-----
> 1 'a'
> 2 'a'
> 3 'a'
> 1 'b'
> 4 'a'
> 2 'b'
>
you will need to use pre insert trigger since you cannot use column
references in default expression.
you could use this same trigger to either:
- create sequences as needed and apply the right one
- with locking, lookup for last id of typ
- with locking, keep another table of typ and nextval
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