On 7 Dec 2016, at 8:40pm, David Raymond <david.raym...@tomtom.com> wrote:
> Question on making indexes for the child fields of foreign keys. I have a > child table with a number of foreign keys on fields which the majority of the > time are null. I've currently got indexes on the child fields for the > purposes of speeding up the foreign key checks, but what I'm wondering is if > I used a conditional index which has "where fkField is not null", will that > index be usable by the internal foreign key checker? Sorry, but the answer is no. SQLite needs to be able to find the rows where the key-value is NULL. It can’t do that from an index which doesn’t include those rows. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
