Roman Neuhauser wrote: > # nis@xxxxxxxxxxxxx / 2006-06-09 10:12:21 +0200: >> Agent M wrote: >>> If you don't use NULL, then you don't >>> come across 3-valued logic--problem solved. >> So was does "SELECT sum(1) FROM dual WHERE false" return? > > You stripped this: > >>> Some Tutorial D notions really make sense; I would love to be able >>> to rely on every function returning a relation. Yes. I didn't see its relevance to the claim that "if you don't use null, you will not come across 3-valued logic". My point being that you need to make sure that your queries don't generate them behind your back either. > So your query would prolly return a table with one (INT) column, > but no rows. Well, if you are not bound by the SQL standard and its mistakes, the "obvious" return value would be one row, one column, containing 0. /Nis
