[英]Inverting the ST_Within query
我正在使用ST_Within,它工作正常,但是我想选择不在凸包内的所有点,如何在sql中反转选择?
SELECT geom FROM pc_processing.pc_201406151141_top top
WHERE st_within(top.geom, (
SELECT st_convexhull(st_collect(geom)) as geom
FROM pc_processing.pc_201407060711_base))
ST_Within
返回一个布尔值,因此您可以检查结果是否为false
SELECT geom FROM pc_processing.pc_201406151141_top top
WHERE st_within(top.geom,
(SELECT st_convexhull(st_collect(geom)) as geom
FROM pc_processing.pc_201407060711_base
)
) = false;
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