On 3/2/12 8:29 AM, "Igor Tandetnik" <itandet...@mvps.org> wrote:
>On 3/2/2012 11:29 AM, Pavel Ivanov wrote: >>> If I am querying data just from t1, is there a performance penalty >>> for using myview in the query? Or will the query planner generate >>> approximately the same bytecode as it would if I'd simply queried >>> t1? >> >> Yes, there is performance penalty and no it can't generate the same >> bytecode. If you ask why the answer is because result set from the >> view can be different than from the table alone - several rows in the >> view can contain information from the same row of t1. > >... while some other rows from t1 may not appear at all. I was assuming that there's a strict many-to-one relationship between t1 and t2. (Should have said.) >-- >Igor Tandetnik > >_______________________________________________ >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
