PostGIS
Description
The << operator returns TRUE if the bounding box of geometry A
is strictly to the left of the bounding box of geometry B.
|
Examples
SELECT tbl1.column1, tbl2.column1, tbl1.column2 << tbl2.column2 AS left
FROM
( VALUES
(1, 'LINESTRING (1 2, 1 5)'::geometry)) AS tbl1,
( VALUES
(2, 'LINESTRING (0 0, 4 3)'::geometry),
(3, 'LINESTRING (6 0, 6 5)'::geometry),
(4, 'LINESTRING (2 2, 5 6)'::geometry)) AS tbl2;
column1 | column1 | left
---------+---------+------
1 | 2 | f
1 | 3 | t
1 | 4 | t
(3 rows)