Dear Igor, Are you saying that
UPDATE alpha SET frequency = (SELECT frequency FROM beta WHERE beta.term = alpha.term) is just as efficient as it gets and equivalent to an update using join (in other dbs)? That would helpful to know. I do kind of imagine some kind of black magic... ;) On Wed, Sep 5, 2012 at 12:24 PM, Igor Tandetnik <itandet...@mvps.org> wrote: > On 9/5/2012 12:38 PM, E. Timothy Uy wrote: > >> I have a column in table 'alpha' which I would like to populate with data >> from table 'beta'. As far as I know, we cannot do an UPDATE using JOIN in >> sqlite, but we can >> >> UPDATE alpha SET frequency = (SELECT frequency FROM beta WHERE beta.term = >> >>> alpha.term) >>> >> >> Will the database really be doing a select in beta for >> every single line in alpha? >> > > Yes - same as when implementing a join. How do you think a join is > performed - black magic? > -- > Igor Tandetnik > > ______________________________**_________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-**bin/mailman/listinfo/sqlite-**users<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
