参考：https://blog.csdn.net/aliasone/article/details/80644306
正确写法：
SELECT st_x(the_geom) FROM "geo_dangerpoint_b"
原因：st_point(float8,float8)
SELECT ST_Point(116.39088,39.90763)
标签：point,geometry,postgis,st,报错,SELECT From： https://www.cnblogs.com/2008nmj/p/16739344.html