Steve Midgley <public@misuse.org> writes:
> select * from test_order
> order by id <> 3, email
> --sql end
> Putting the expression "id <> 3" causes the id of 3 to sort to the TOP
> of the list. This statement does the same thing:
> select * from test_order
> order by id = 3 DESC, email
> I know there is a good, rational reason for this, and I'm hoping
> someone will explain it to me?
These expressions yield boolean true or false, and false sorts before true.
regards, tom lane
