+ # NOTE:
+ # Postgres is really picky about the order of implicit CROSS JOINs with ','
+ # if you alias the tables and want to use the alias later in another JOIN.
+ # the alias you want to use has to be the most recent in the list, otherwise
+ # Postgres will overwrite the alias internally and complain.
+ # For this reason, in the next 3 SELECTs, the 'a' alias is last in the list.
+ # Don't change this, and if you do, substitute the ',' with CROSS JOIN
+ # ... that also works.
+