Is there any chance to get some kind of a result set sifting mechanism in Postgres?
What I am looking for is a way to get for example: "nulls last" in a result set, without having to call "order by" or having to use UNION ALL, and if possible to get this in a single result set pass.
Something on this line: SELECT a, b, c FROM my_table WHERE a nulls last OFFSET 0 LIMIT 25
I don't want to use order by or union all because these are time consuming operations, especially on large data sets and when comparations are done on dynamic values (eg: geolocation distances in between a mobile and a static location)
This already exists: ORDER BY a IS NULL
I've found it to be more useful than one might initially expect to order by a boolean expression.
