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How could I create a topology for a custom generated geometry table having just the_geom geometry(linestring) column? Because pgr_createTopolgy() asks for the gid column also for a given table, which is not something like primary key.

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Why do you think that gid is not a primary key? Because the pgr_createTopology function requires a serial ID column as argument (the default column name is id), you could simply add it like this:

ALTER TABLE foo ADD column id serial;

Is there a reason, why this is not possible in your case?

  • My bad. There was some inconsistency in my the_geom column's SRID. Indeed pgr_createTopology simply asks for geometry column and serial ID column and is working just fine. Thanks. – Zia Sep 25 '14 at 7:28

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