ST_IsSimple returns 1 (Oracle) or t (PostgreSQL) if the geometry object is simple; otherwise, it returns 0 (Oracle) or f (PostgreSQL).
Oracle
sde.st_issimple (g1 sde.st_geometry)
PostgreSQL
st_issimple (g1 st_geometry)
The table issimple_test is created with two columns. The pid column is a smallint data type containing the unique identifier for each row. The g1 ST_Geometry column stores the simple and nonsimple geometry samples.
CREATE TABLE ISSIMPLE_TEST (pid smallint, g1 sde.st_geometry);
The INSERT statements insert two records into the issimple_test table. The first is a simple linestring because it doesn't intersect its interior. The second is nonsimple because it does intersect its interior.
Oracle
INSERT INTO issimple_test VALUES (
1,
sde.st_linefromtext ('linestring (10 10, 20 20, 30 30)', 0)
);
INSERT INTO issimple_test VALUES (
2,
sde.st_linefromtext ('linestring (10 10, 20 20, 20 30, 10 30, 10 20,
20 10)', 0)
);
PostgreSQL
INSERT INTO issimple_test VALUES (
1,
st_linestring ('linestring (10 10, 20 20, 30 30)', 0)
);
INSERT INTO issimple_test VALUES (
2,
st_linestring ('linestring (10 10, 20 20, 20 30, 10 30, 10 20,
20 10)', 0)
);
The query returns the results of the ST_IsSimple function. The first record returns 1 because the linestring is simple, while the second record returns 0 because the linestring is not simple.
Oracle
SELECT pid, sde.st_issimple (g1) Is_it_simple
FROM issimple_test;
PID Is_it_simple
1 1
2 0
PostgreSQL
SELECT pid, st_issimple (g1) AS Is_it_simple
FROM issimple_test;
pid is_it_simple
1 t
2 f