Getting individual co-ordinates

Question

I have a polyline object stored as a geometry in each row of a table. I want to create a table of all the nodes of all the polylines within this table. Currently I fetch each record, check the number of nodes in the object and then extract each node and add one record at a time in the co-ordinates table.
Is there any way of doing this in a single query? The number of co-ordinates for individual polylines is not fixed.
Any thoughts?
TIA

Answer 1

Thanks people, I have solved my problem myself, this is what I did.
REATE TYPE SP_NODE_TYPE AS OBJECT
(id NUMBER,
x NUMBER,
y NUMBER);
CREATE TYPE SP_NODE_SET_TYPE as TABLE OF SP_NODE_TYPE;
CREATE OR REPLACE Function GetCoordinates(polyline IN MDSYS.SDO_GEOMETRY) RETURN SP_NODE_SET_TYPE
PIPELINED
AS
ordCount NUMBER;
ordNumber NUMBER;
BEGIN
ordCount := nvl(polyline.sdo_ordinates.COUNT,0);
if (ordCount > 4) then
ordNumber := 2;
for idx in 3..(ordCount - 2) loop
if ((idx Mod 2) = 1) then
PIPE ROW (SP_NODE_TYPE(ordNumber, polyline.sdo_ordinates(idx), polyline.sdo_ordinates(idx + 1)));
ordNumber := ordNumber + 1;
end if;
end loop;
end if;
RETURN;
END;
don't bother about the logic, in my case, I only wanted the intermediate points not the start and end point.
After this a query like :
SELECT mylines.id, myvertices.X, myvertices.Y, myvertices.id
FROM mylines,
TABLE(getcoordinates(e.geoloc)) myvertices ORDER BY e.id, myvertices.id;
does the trick for me!!
'PIPE' and 'PIPELINE' is something new which I learned from this experience.
--A Happy Plumber.