On 3 Apr 2017, at 12:27am, Hamish Allan <ham...@gmail.com> wrote: > SELECT d FROM x WHERE b = 1 GROUP BY c ORDER BY a;
Your problem comes down to this: If you are GROUPing BY c, why do you want ORDER BY a ? If you remove the "ORDER BY a" clause then the ideal index would be on (b, c). But to deal with the ORDER BY we need to know whether "a" is a subgroup of "c". My guess is that (b, c, a) would be the best index. But it depends on whether a is a subgroup of b or c. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
