On Fri, Jul 2, 2010 at 11:19 AM, P Kishor <punk.k...@gmail.com> wrote: > On Fri, Jul 2, 2010 at 11:15 AM, Peng Yu <pengyu...@gmail.com> wrote: >> Hi, >> >> SELECT DISTINCT type_id FROM foods; >> >> If I use 'distinct', any entry that shows up greater or equal to one >> time will only appear once. But I want to select an entry that appears >> <=n times and only show n times if it appears more than n times. I >> think that "group by" might help. But I'm not familiar with SQL enough >> yet. Would you please let me know what command to use? >> > > Try > > SELECT <whatever column>, Count(type_id) > FROM foods > GROUP BY <whatever column> > HAVING Count(type_id) < n
make that HAVING Count(type_id) <= n > > >> -- >> Regards, >> Peng >> _______________________________________________ >> sqlite-users mailing list >> sqlite-users@sqlite.org >> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users >> > > > > -- > Puneet Kishor http://www.punkish.org > Carbon Model http://carbonmodel.org > Charter Member, Open Source Geospatial Foundation http://www.osgeo.org > Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor > Nelson Institute, UW-Madison http://www.nelson.wisc.edu > ----------------------------------------------------------------------- > Assertions are politics; backing up assertions with evidence is science > ======================================================================= > -- Puneet Kishor http://www.punkish.org Carbon Model http://carbonmodel.org Charter Member, Open Source Geospatial Foundation http://www.osgeo.org Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor Nelson Institute, UW-Madison http://www.nelson.wisc.edu ----------------------------------------------------------------------- Assertions are politics; backing up assertions with evidence is science ======================================================================= _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
