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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