# ST_Disjoint

Release 9.3
Note: This topic was updated for 9.3.1.

## Definition

ST_Disjoint takes two geometries and returns 1 (Oracle) or t (PostgreSQL) if the intersection of two geometries produces an empty set; otherwise, it returns 0 (Oracle) or f (PostgreSQL).

## Syntax

Oracle

``sde.st_disjoint (g1 sde.st_geometry, g2 sde.st_geometry)``

PostgreSQL

``st_disjoint (g1 st_geometry, g2 st_geometry)``

Boolean

## Example

This example creates two tables, sensitive_areas and hazardous_sites, and inserts values into each.

Oracle

``````CREATE TABLE sensitive_areas (id integer,
zone sde.st_geometry);
CREATE TABLE hazardous_sites (id integer,
location sde.st_geometry);
INSERT INTO sensitive_areas VALUES (
1,
sde.st_polygon ('polygon ((20 30, 30 30, 30 40, 20 40, 20 30))', 0)
);
INSERT INTO sensitive_areas VALUES (
2,
sde.st_polygon ('polygon ((30 30, 30 50, 50 50, 50 30, 30 30))', 0)
);
INSERT INTO sensitive_areas VALUES (
3,
sde.st_polygon ('polygon ((40 40, 40 60, 60 60, 60 40, 40 40))', 0)
);
INSERT INTO hazardous_sites VALUES (
4,
sde.st_point ('point (60 60)', 0)
);
INSERT INTO hazardous_sites VALUES (
5,
sde.st_point ('point (30 30)', 0)
);``````

PostgreSQL

``````CREATE TABLE sensitive_areas (id integer,
zone st_geometry);
CREATE TABLE hazardous_sites (id integer,
location st_geometry);
INSERT INTO sensitive_areas VALUES (
1,
st_polygon ('polygon ((20 30, 30 30, 30 40, 20 40, 20 30))', 0)
);
INSERT INTO sensitive_areas VALUES (
2,
st_polygon ('polygon ((30 30, 30 50, 50 50, 50 30, 30 30))', 0)
);
INSERT INTO sensitive_areas VALUES (
3,
st_polygon ('polygon ((40 40, 40 60, 60 60, 60 40, 40 40))', 0)
);
INSERT INTO hazardous_sites VALUES (
4,
st_point ('point (60 60)', 0)
);
INSERT INTO hazardous_sites VALUES (
5,
st_point ('point (30 30)', 0)
);``````

The SELECT statement lists the names of all sensitive areas that are outside the buffer of a hazardous waste site. You could use the ST_Intersects function instead in this query by equating the result of the function to 0, because ST_Intersects and ST_Disjoint return the opposite results.

Oracle

``````SELECT sa.id
FROM sensitive_areas sa, hazardous_sites hs
WHERE sde.st_disjoint ((sde.st_buffer (hs.location, .1)), sa.zone) = 1
AND hs.id = 5;
ID
3``````

PostgreSQL

``````SELECT sa.id
FROM sensitive_areas sa, hazardous_sites hs
WHERE st_disjoint ((st_buffer (hs.location, .1)), sa.zone) = 't'
AND hs.id = 5;
id
3``````