Oracle 11g: Split a line string in a set of two-points-line

Question

Hi,
I have n Oracle RDBMS 11gR2 EE database.
I have a single 2-D linestring with about 100 points.
Does someone know a technic to "split" that line in an adajacent set of lines composed of 2 points only?
Thanks by advance for any tips.
Kind Regards

Answer 1

Hi
As John explained, that book is extremely recommended, well written and comes with a lot of examples.
In addition, a simple SQL example I used 6 years ago:
select id,
       sdo_geometry(2002, NULL, NULL,
           SDO_ELEM_INFO_ARRAY(1,2,1),
           SDO_ORDINATE_ARRAY(startx, starty, endx, endy)
from
    select
         startp.strtcnt_id, startp.x startx, startp.y starty, startp.v_id, endp.x endx, endp.y endy, endp.v_id
    from
        select strtcnt_id, t.id v_id, t.x, t.y
        from YOUR_TABLE_NAME s, table(sdo_util.getvertices(geometry)) t
        ) startp
        select strtcnt_id, t.id v_id, t.x, t.y
        from YOUR_TABLE_NAME s, table(sdo_util.getvertices(geometry)) t
        ) endp
    where startp.id = endp.id
    and startp.v_id = endp.v_id - 1
The inner selects can be made simpler and more performant I believe using the with clause, but it should work.
Luc