[postgis-users] Polygon union

[Brian Sanjeewa Rupasinghe]

Hi,

I use ST_union aggregate function to union a set of polygons with group by
clause.
I see there is another function ST_UnaryUnion() in PostGIS. Can i use it
instead of
normal ST_Union? When i replaced ST_Union with ST_UnaryUnion in the query,
it gave me an error because it is not an aggregate function. So how to use
this function
in a PostGIS query which selects group of polygons using group by clause?

Cheers, Brian.
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