I have the following table in postgis 
I want to group the species along with geometries based on column values of 'val' i.e
11,11,11,11,11,11,11-corresponding species
6,6-corresponding species
12,12-corresponding species
How to do this in postgis?
val? (similar to qgis dissolve by attribute?) – Steven Kay Jan 19 '16 at 21:38