> -----Original Message----- > From: Adrian Klaver [mailto:adrian.kla...@aklaver.com] > Sent: Donnerstag, 11. Juni 2015 16:31 > To: Marc Mamin; 'Geoff Winkless'; Postgres General > Subject: Re: [GENERAL] select count(*); > > On 06/11/2015 07:17 AM, Marc Mamin wrote: > >>> That's the point. * has no meaning without FROM > > > > > >> But COUNT(*) > >> > >> does have meaning - it means "the number of rows". > > > > which rows? :-) > > To follow up on the post from Chris Mair: > > test=> select count(*), 'foo'; > count | ?column? > -------+---------- > 1 | foo
Fine, This explains why the result must be 1 :) Marc > > See also: > > http://www.postgresql.org/docs/9.4/interactive/functions-aggregate.html > > > count(*) bigint number of input rows > > > >> It's not counting the number of columns in the row, so postgres > doesn't need to know what columns exist in the row to return a row > count. > > > >> Geoff > > > > > > > -- > Adrian Klaver > adrian.kla...@aklaver.com -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
