It's not clear what you're trying to do but can you simply store the 15000 as positive or negative? Then you always add. Adding a negative is same as subtracting.
Sean On Jul 1, 2:35 pm, "Bob Pawley" <[email protected]> wrote: > Hi > > I have an expression such as - > > select ST_distance(st_centroid(p_id.p_id.the_geom), > st_boundary(p_id.p_id.the_geom))/2 + 15000 > from p_id.p_id > where p_id.p_id.process_id = '1012' ; > > This works > > I can access the number 15000 from a table as a variable. > > I want to be able to also access the + (or -) from a table as a variable but > can't figure out how to do this. > > Is it possible to store math operators and access them from a table?? > > Bob > > _______________________________________________ > postgis-users mailing list > [email protected]http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
