My hate is that there are too many standards in SQL and there is no single standard that is supported by all mainstream databases, and they even differ per release.
Additionally, (mainstream) database get shipped where the default is to not respect the ANSI standard, because (they state) it (the standard) is slowing down (performance), so you have to set options to make it comply to the standard(s) so you can write portable (ahum) SQL.
BTW, IMHO there is no perfect database. They all suck in some way. Maybe a new poll: Which database sucks most (and why).
Enjoy, Have FUN! H.Merijn