SDO_RELATE OR SDO_GEOM.RELATE

Question

hii. i want to get an information that for example districts in a specified city.i try to use sdo_relate and sdo_geom.relate but i could not get true result.
SELECT * FROM DISTRICTS WHERE SDO_RELATE(DISTRICTS .OGC_GEOMETRY,(SELECT OGC_GEOMETRY FROM CITY WHERE CITY_ID=2),'MASK=ANYINTERACT')='TRUE'
or
select * from DISTRICTS where sdo_geom.relate((select ogc_geometry from CİTY where CİTY_ID=2),'ANYINTERACT',DISTRICTS .ogc_geometry,0000000001)='TRUE'
WHEN i use these statement i get some results but it contains also neighbours. therefore i try to use
select * from DISTRICTS where sdo_geom.relate((select ogc_geometry from city where city_ID=2),'CONTAINS',DISTRICTS .ogc_geometry,0000000001)='TRUE'
or
SELECT * FROM DISTRICTS WHERE SDO_RELATE(DISTRICTS.OGC_GEOMETRY,(SELECT OGC_GEOMETRY FROM city WHERE city_ID=2),'MASK=ANYINTERACT')='TRUE'
but when i use these i could not get any information. result set is empty. why? where is the problem. thanks to everyone for help.

Answer 1

The point here is to figure out what is going on.
1. If you would union your 9 items you expect to be returned, would that be exactly the same geometry as the city (id=2)?
No? In that case you need to clarify how the districts and the city are related to each other. In this case it make sense you have the result using
('mask=covers+covererby')
Yes? In that case I see 2 options.
A. The geometry is not correctly continously formed.
B. The tolerance set in the user_sdo_geom_metadata for the districts does not suit its geometries.
I assusme also you validated your data.