Postgresql PostGIS中最近邻搜索错误
我正在尝试编写一个PostGIS最近邻查询,其中选择了一组坐标,并确定了与洪水最近多边形的距离。然后我想将距离分为“外部”、“闭合”或“内部”:Postgresql PostGIS中最近邻搜索错误,postgresql,postgis,nearest-neighbor,Postgresql,Postgis,Nearest Neighbor,我正在尝试编写一个PostGIS最近邻查询,其中选择了一组坐标,并确定了与洪水最近多边形的距离。然后我想将距离分为“外部”、“闭合”或“内部”: WITH point_loc (geom) AS ( SELECT ST_SetSRID(ST_MakePoint(531673.0, 180848.2),27700) ), distances (gid, distance) AS ( SELECT fl.gid, ST_Distance(fl.
WITH
point_loc (geom) AS (
SELECT ST_SetSRID(ST_MakePoint(531673.0, 180848.2),27700) ),
distances (gid, distance) AS (
SELECT
fl.gid,
ST_Distance(fl.geom, p.geom) AS distance
FROM
point_loc p, flooding fl
WHERE ST_DWithin(p.geom, fl.geom, 400)
SELECT
gid,
CASE WHEN distance > 300 THEN 'OUTSIDE'
WHEN distance > 50 AND <= 300 THEN 'CLOSE'
ELSE 'INSIDE'
END as flood_result
FROM distances;
我在最后一次SELECT调用中一直遇到语法错误。有人能看出我做错了什么吗?您的第二个CTE缺少一个右括号 这一行: 其中ST_DWithinp.geom,fl.geom,400 应该是: 其中ST_DWithinp.geom,fl.geom,400