<<| — Aのバウンダリボックスが、厳密にBのバウンダリボックスの下にある場合にTRUE
を返します。
boolean <<|(
geometry
A
,
geometry
B
)
;
SELECT tbl1.column1, tbl2.column1, tbl1.column2 <<| tbl2.column2 AS below FROM ( VALUES (1, 'LINESTRING (0 0, 4 3)'::geometry)) AS tbl1, ( VALUES (2, 'LINESTRING (1 4, 1 7)'::geometry), (3, 'LINESTRING (6 1, 6 5)'::geometry), (4, 'LINESTRING (2 3, 5 6)'::geometry)) AS tbl2; column1 | column1 | below ---------+---------+------- 1 | 2 | t 1 | 3 | f 1 | 4 | f (3 rows)