François <francois.goldgewi...@gmail.com> wrote: > Let us consider a table "ITEM" with a BOOLEAN field "FLAG". This table > may contain up to 100 000 entries and those entries can be selected > using "WHERE ITEM.FLAG = ?" conditions. > > Is then a good or a bad practice to add an index on this field if we > want to improve SELECT time execution ?
This may help if and only if a) you have many more records with FLAG=1 than with FLAG=0 (or vice versa); and b) most of the time, you are looking up the records belonging to the small subset. For example, if there's a small number of "active" or recent records that need to be processed, and a large archive of "processed" records. However, in such a case, you might be even better off splitting the small subset into its own separate table. -- Igor Tandetnik _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
