I have multi-part SDO_GEOMETRIES in Oracle 18c.
I can extract the parts as individual rows using the SDO_UTIL.EXTRACT_ALL() function:
with cte as ( --Each part is wrapped in brackets and separated by commas: (p1),(p2) select sdo_geometry('MULTILINESTRING((1 1 1, 2 2 2),(3 3 3, 4 4 4))') as shape from dual union all --3D: (X,Y,Z) select sdo_geometry('MULTILINESTRING((5 5, 6 6),(7 7, 8 8),(9 9, 0 0))') as shape from dual union all --2D: (X,Y) select sdo_geometry('MULTILINESTRING((1 1, 2 2))') as shape from dual --2D: (X,Y) ) select a.object_value, sdo_util.to_wktgeometry(a.object_value) from cte, table(sdo_util.extract_all(shape)) a OBJECT_VALUE SDO_UTIL.TO_WKTGEOMETRY(A.OBJECT_VALUE) -------------------- --------------------------------------- [MDSYS.SDO_GEOMETRY] LINESTRING (1.0 1.0 1.0, 2.0 2.0 2.0) [MDSYS.SDO_GEOMETRY] LINESTRING (3.0 3.0 3.0, 4.0 4.0 4.0) [MDSYS.SDO_GEOMETRY] LINESTRING (5.0 5.0, 6.0 6.0) [MDSYS.SDO_GEOMETRY] LINESTRING (7.0 7.0, 8.0 8.0) [MDSYS.SDO_GEOMETRY] LINESTRING (9.0 9.0, 0.0 0.0) [MDSYS.SDO_GEOMETRY] LINESTRING (1.0 1.0, 2.0 2.0)
db<>fiddle here
I want to add the following columns to the query:
MULTILINE_NUM PART_NUM OBJECT_VALUE SDO_UTIL.TO_WKTGEOMETRY(A.OBJECT_VALUE) ------------- -------- -------------------- --------------------------------------- 1 1 [MDSYS.SDO_GEOMETRY] LINESTRING (1.0 1.0 1.0, 2.0 2.0 2.0) 1 2 [MDSYS.SDO_GEOMETRY] LINESTRING (3.0 3.0 3.0, 4.0 4.0 4.0) 2 1 [MDSYS.SDO_GEOMETRY] LINESTRING (5.0 5.0, 6.0 6.0) 2 2 [MDSYS.SDO_GEOMETRY] LINESTRING (7.0 7.0, 8.0 8.0) 2 3 [MDSYS.SDO_GEOMETRY] LINESTRING (9.0 9.0, 0.0 0.0) 3 1 [MDSYS.SDO_GEOMETRY] LINESTRING (1.0 1.0, 2.0 2.0)
When adding those columns, I don't want to "fake it" after-the-fact using window functions, etc.
I want to extract that information directly from the geometries, to ensure the numbers are correct (i.e., part number shouldn't be arbitrary; it should reflect the part number order from the original geometry).
Is there a way to get the MULTILINE_NUM and PART_NUM from the table(sdo_util.extract_all(shape)) query?
Adapting my answer to your previous question, you can use:
with cte (shape) as (
--Each part is wrapped in brackets and separated by commas: (p1),(p2)
select sdo_geometry('MULTILINESTRING((1 1 1, 2 2 2),(3 3 3, 4 4 4))') from dual union all --3D: (X,Y,Z)
select sdo_geometry('MULTILINESTRING((5 5, 6 6),(7 7, 8 8),(9 9, 0 0))') from dual union all --2D: (X,Y)
select sdo_geometry('MULTILINESTRING((1 1, 2 2))') from dual --2D: (X,Y)
)
select c.multiline_num,
e.part_no,
sdo_util.to_wktgeometry(e.elem)
from ( SELECT ROWNUM AS multiline_num,
shape
FROM cte
) c
CROSS JOIN LATERAL (
SELECT LEVEL AS part_no,
SDO_UTIL.EXTRACT(c.shape, LEVEL) AS elem
FROM DUAL
CONNECT BY LEVEL <= SDO_UTIL.GETNUMELEM(c.shape)
) e;
Which outputs:
MULTILINE_NUM PART_NO SDO_UTIL.TO_WKTGEOMETRY(E.ELEM) 1 1 LINESTRING (1.0 1.0 1.0, 2.0 2.0 2.0) 1 2 LINESTRING (3.0 3.0 3.0, 4.0 4.0 4.0) 2 1 LINESTRING (5.0 5.0, 6.0 6.0) 2 2 LINESTRING (7.0 7.0, 8.0 8.0) 2 3 LINESTRING (9.0 9.0, 0.0 0.0) 3 1 LINESTRING (1.0 1.0, 2.0 2.0)
Or, using SDO_UTIL.EXTRACT_ALL:
with cte (shape) as (
--Each part is wrapped in brackets and separated by commas: (p1),(p2)
select sdo_geometry('MULTILINESTRING((1 1 1, 2 2 2),(3 3 3, 4 4 4))') from dual union all --3D: (X,Y,Z)
select sdo_geometry('MULTILINESTRING((5 5, 6 6),(7 7, 8 8),(9 9, 0 0))') from dual union all --2D: (X,Y)
select sdo_geometry('MULTILINESTRING((1 1, 2 2))') from dual --2D: (X,Y)
)
select c.multiline_num,
e.part_no,
sdo_util.to_wktgeometry(e.elem)
from ( SELECT ROWNUM AS multiline_num,
shape
FROM cte
) c
CROSS JOIN LATERAL (
SELECT ROWNUM AS part_no,
a.object_value AS elem
FROM TABLE(SDO_UTIL.EXTRACT_ALL(c.shape)) a
) e;
Which outputs the same.
db<>fiddle here