On Tue, Aug 16, 2011 at 2:24 PM, Simon Slavin <slav...@bigfraud.org> wrote: > > On 16 Aug 2011, at 9:39am, Filip Navara wrote: > >> create table a (a, b, c, d); >> create index aIdx on a (a, d); >> >> Now the data in columns "b" and "c" can be pretty large. Let's make >> the following query: >> >> select a, d from a; >> >> Full-table scan is done even if an index exists that covers all the >> data required by the query. > > That's a little strange. > > Please execute the SQL command ANALYZE on that database. Then do your > 'EXPLAIN' tests again. It won't fix the problem but it'll tell us something > useful. > > http://www.sqlite.org/lang_analyze.html
It doesn't fix anything. It's not even possible to force the index usage using INDEXED BY. Best regards, Filip Navara _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
