On Sun, Mar 13, 2011 at 10:31 AM, Igor Tandetnik <itandet...@mvps.org> wrote: > Garry Watkins <ga...@dynafocus.com> wrote: >> Not sure why you are using a subselect with a union all. >> >> SELECT * >> FROM multiturnTable >> WHERE (player1 ='?' OR player2 ='?') > > Because OR prevents SQLite from using an index on either player1 or player2, > and turns the query into full table scan.
Recent releases can optimize ORs into UNION ALLs. Nico -- _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
