Saturday, 27 June 2015

postgis - How can I find features that do not touch any other feature?



How can I find features that do not touch any other feature? I have about 4000 pipeline elements and I want to know which of them are separated from the network. I tried with:


SELECT h1.gid FROM pipelines h1, pipelines h2 WHERE ST_Disjoint(h1.geom, h2.geom)


but I get too many results.




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