Is it just me, or the first book looks like somewhat polished version of what comes with postgresql-doc?
Second book is a good summary, albeit a bit outdated -- no info about ANSI outer joins is given. Still, on both counts, it is quite nice to have docs like that available on-line.
Slightly off-topic, but does anybody know of any "road map" type document posted by PostgreSQL team? Just curious to see what is in the upcoming releases...
