&<

Name

&< — Returns TRUE if A's bounding box overlaps or is to the left of B's.

Synopsis

boolean &< ( geometry A , geometry B ) ;

Description

The &< operator returns TRUE if the bounding box of geometry A overlaps or is to the left of the bounding box of geometry B, or more accurately, overlaps or is NOT to the right of the bounding box of geometry B.

[Note]

This operand will make use of any indexes that may be available on the geometries.

Examples

SELECT tbl1.column1, tbl2.column1, tbl1.column2 &< tbl2.column2 AS overleft
FROM
  ( VALUES
	(1, 'LINESTRING(1 2, 4 6)'::geometry)) AS tbl1,
  ( VALUES
	(2, 'LINESTRING(0 0, 3 3)'::geometry),
	(3, 'LINESTRING(0 1, 0 5)'::geometry),
	(4, 'LINESTRING(6 0, 6 1)'::geometry)) AS tbl2;

 column1 | column1 | overleft
---------+---------+----------
	   1 |       2 | f
	   1 |       3 | f
	   1 |       4 | t
(3 rows)