You are right Klaas, it should be -2 not -3. You could always constrain id to (MAXINT >= id >= 3-MAXINT) if you wanted to be sure there would not be an arithmetic overflow.
--- () ascii ribbon campaign against html e-mail /\ www.asciiribbon.org > -----Original Message----- > From: sqlite-users-boun...@sqlite.org [mailto:sqlite-users- > boun...@sqlite.org] On Behalf Of Klaas V > Sent: Sunday, 12 August, 2012 12:49 > To: SQLite MailList > Subject: Re: [sqlite] how to update the Moving average value > > Keith Metcalf wrote: > > > >id Sales_vol mov_avg > >1 1 > >2 2 > >3 3 =(1+2+3)/3 > >4 5 =(2+3+5)/3 > >5 4 =(3+5+4)/3 > >6 2 =(5+4+2)/3 > >7............ > > >select id, sales_vol, (select avg(sales_vol) as mavg > > from tbl b > > where b.id between a.id - 3 and a.id) > > from tbl a; > > - 3 should be - 2. You're working with the last 4 days and might get an error > if id=3 > :P > > > Cordiali saluti/Vriendelijke groeten/Kind regards, > Klaas V > > http://innocentisart.net > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
