Clodoaldo Pinto <clodoaldo.pinto@xxxxxxxxx> writes:
> I'm ordering by date just to show that sunday, the 0th day of the
> week, is the last day of a given week, which is not what I need.
extract(week) follows the ISO definition of week, which is pretty
strange anyway, but in particular it says that weeks start on Monday.
extract(dow) follows a different convention. There's not a lot we
can do about this --- we're certainly not going to change extract(week),
and I can't see changing extract(dow) either.
If you feel that weeks start on Sunday you should ignore extract(week).
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
