Hi
I am attemptijng to use the ST_Union function to collapse three rows from a
table called tank_lin into one row in table called process_dgm.
Here's what I used -
Insert into graphics.process_dgm(the_geom)
Select ST_Union(the_geom)
from tank_lin
Group by tank_lin.the_geom;
The result is three rows inserted into process_dgm, each row appearing to be
simple copies of each of the original rows.
I also attempted group by another column but received error 'unknown
geometry'.
I also tried STR_LineMerge with similar results.
What am I not considering?
Bob
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