Thank you, Igor. Processing time: 5 seconds. :-)
Igor Tandetnik wrote: > Tim Romano <tim.rom...@yahoo.com> wrote: > >> I've read http://www.sqlite.org/optoverview.html but don't find my >> answer there. >> >> In the following query, WOIDS has 4 million rows and CORNFIX has >> 25,000 rows. >> >> UPDATE WOIDS >> SET corn = 1 >> WHERE EXISTS >> ( >> SELECT * >> FROM CORNFIX >> WHERE (cornfix.col_1 = woids.ttl) AND (cornfix.col_2 = >> woids.pos) AND (cornfix.col_3 = woids.wrdid) >> ) >> > > Try this instead: > > update WOIDS set corn=1 where rowid in > (select w2.rowid > from cornfix join woids w2 on ( > cornfix.col_1 = w2.ttl AND cornfix.col_2 = w2.pos AND cornfix.col_3 = > w2.wrdid) > ); > > I'm not sure, but this structure might help SQLite choose cornfix for the > outer loop. > > Igor Tandetnik > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.425 / Virus Database: 270.14.60/2496 - Release Date: 11/11/09 > 07:40:00 > > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
