I expected it to return 46 results, not fewer as you mentioned, except it returns 51 which I am trying to figure out why ... there is only one duplicate in Temp, but why would that still produce more results then 46?
Igor Tandetnik wrote: > > "Cnichols" <cnichol...@gmail.com> wrote > in message news:21685825.p...@talk.nabble.com >> Stats does contain 46 qids with sids of 7 >> there is one duplicate question now that i look harder in temp which >> is ok because 289 I forgot to mention that id in temp is not a key, >> this is because there is a test mode to ask random questions that >> aren't unique (so 289 was asked twice). >> >> but if i did this >> SELECT Count() FROM Stats S >> LEFT JOIN Temp T ON T.Id = S.QuestionId >> WHERE S.SessionId = 7 >> >> Shouldn't only still return 46 rows and not 51 since stats in on the >> left and we are only getting associated data from the right? > > LEFT JOIN produces all the same rows as INNER JOIN, plus some rows from > left table that don't have a match in the right one. Thus, LEFT JOIN > cannot possibly generate fewer rows than a corresponding INNER JOIN. I'm > not sure why you expect it to. > > Igor Tandetnik > > > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > -- View this message in context: http://www.nabble.com/INNER-JOIN%2C-JOIN-Confusin-tp21676221p21686280.html Sent from the SQLite mailing list archive at Nabble.com. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
