Kelly Jones wrote: > I have a query that runs very quickly and returns no results: > > SELECT * FROM filebackup WHERE sha1='x'; > > However, the more restrictive query below runs very slowly, although > it obviously can't have any results either: > > SELECT * FROM filebackup WHERE sha1='x' AND refid=0; > > I have indexes on both sha1 (string) and refid (int). Only issue I > see: this is a large table and refid=0 for 90%+ of the rows.
For whatever reason, SQLite decides to use an index on refid for this query. You can suppress it like this: SELECT * FROM filebackup WHERE sha1='x' AND +refid=0; Igor Tandetnik _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
