Name

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

Synopsis

boolean <<( geometry A , geometry B );

Description

The << operator returns TRUE if the bounding box of geometry A is strictly to the left 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 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)

See Also

>>, |>>, <<|