[mrtbld]

> Also any sane person would never sort random values.

I think sorting by a arbitrary, unique value as the last sorting dimension is useful to ensure you always get the same ordering when first dimensions are equal. For instance sorting users by (last_name, first_name, user_id) ensures homonymous users don't move around in the list from request to request.

This is quite a sane thing to do, don't you think?

[anotherevan]

Yes, I do that all the time. Even for tables that have a sequence column to indicate the desired display order, I'll add the primary key on the end of the order by to ensure consistency just on the off chance of two rows having the same seq value.