小编use*_*846的帖子

我在 Windows 10 中使用 Postgis 2.4 和 posgresql 10。我有以下 SQL 查询：

WITH data (the_geom) as (
  SELECT a.gid,
          CASE WHEN ST_Within(a.geom,b.geom) THEN a.geom 
               ELSE ST_Intersection(a.geom,b.geom) 
          END AS the_geom  
  FROM source.g100_wby_lakes_r as a 
      JOIN extents.map_areas as b ON ST_Intersects(a.geom,b.geom) 
  WHERE b.map_id='AA01'
) 
INSERT into public.g100_wby_lakes_r (gid,geom) 
select * 
from data 
where st_GeometryType(the_geom)='MULTIPOLYGON';

它尝试选择两个多边形之间的交点，并且只将相交的几何图形插入到新表中，这些几何图形也是多边形（交点也可能导致点或线）。除了给出以下错误的 WHERE 子句外，所有工作都有效：

WITH data (the_geom) as (
  SELECT a.gid,
          CASE WHEN ST_Within(a.geom,b.geom) THEN a.geom 
               ELSE ST_Intersection(a.geom,b.geom) 
          END AS the_geom  
  FROM source.g100_wby_lakes_r as a 
      JOIN extents.map_areas as b ON …