2010/1/19 Philippe Lang <philippe(dot)lang(at)attiksystem(dot)ch>:
> That works just fine, but is there maybe a way of creating a slighly
> more "generic" index? If I change the ">" with a "<" in the query, index
> cannot of course be used. According to documentation, answer seems to be
> "no"...
>
You could create an index on the difference:
create index long_transformation_index on indexed_table
((data1-this_is_a_long_transformation(data2)));
then rewrite your queries accordingly:
... WHERE data1-this_is_a_long_transformation(data2) > some const (or
< some const)
HTH,
Dean