\h select in psql says (among other things)
[ { UNION | INTERSECT | EXCEPT [ ALL ] } select ]
I think it should read
[ { UNION | INTERSECT | EXCEPT } [ ALL ] select ]
(the SQL reference says the same thing as psql)
--
Alvaro Herrera (<alvherre[(at)]atentus(dot)com>)
"La virtud es el justo medio entre dos defectos" (Aristoteles)