On 11/18/10 8:57 PM, "Dan Kennedy" <danielk1...@gmail.com> wrote:
On 11/19/2010 05:22 AM, Duquette, William H (316H) wrote: > On 11/18/10 2:16 PM, "Drake Wilson"<dr...@begriffli.ch> wrote: > > Quoth "Duquette, William H (316H)"<william.h.duque...@jpl.nasa.gov>, on > 2010-11-18 14:08:10 -0800: >> It seems to me that it shouldn't be necessary for SQLite to evaluate >> FOO's comparison function when doing queries on mytable; the >> collation order should be implicit in the mykey column's index. Is >> this in fact the case? > > When doing which queries? > > How do you propose to look up a key value in the index without using > the collation function? > > I was thinking of queries like > > SELECT mykey FROM mytab ORDER BY mykey The collation sequence callback will not be invoked in that case. SQLite will just iterate from start to finish of the index b-tree. You do need to have the collation sequence registered when compiling the query though. Dan. Thanks, Dan. That's what I was expecting. :-) _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users -- Will Duquette -- william.h.duque...@jpl.nasa.gov Athena Development Lead -- Jet Propulsion Laboratory "It's amazing what you can do with the right tools." _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
