复合SELECT查询postgreSQL / postGIS

Question

提供一个简单的语法问题，但是我有一个postGIS查询，希望在单个表上运行：

SELECT 
    ST_Overlaps(g1.geom,g2.geom) AS asr_01
FROM 
    ch03.my_polygons g1, ch03.my_polygons g2
WHERE 
    g1.agent_type = 0 AND g2.agent_type != 0 AND g1.sim_time = 0.0

可以按预期工作，但我也想选择一个相邻的列，例如

SELECT 
    agent_id 
FROM 
    ch03.my_polygons
WHERE 
    agent_type != 0

它也可以正常工作，但是如何将它们结合起来？试过这个...

SELECT 
    agent_id,
    ST_Overlaps(g1.geom,g2.geom) AS asr_01
FROM 
    ch03.my_polygons,
    ch03.my_polygons g1, ch03.my_polygons g2 
WHERE
    agent_type != 0,
    g1.agent_type = 0 AND g2.agent_type != 0 AND g1.sim_time = 0.0

可能吗？解决这个问题的另一种方法？谢谢

Answer 1

好的，我通过结合使用变量来解决了...

SELECT 
    g2.agent_id,
    ST_Overlaps(g1.geom,g2.geom) AS asr_01
FROM 
    ch03.my_polygons g1, ch03.my_polygons g2 
WHERE
    g1.agent_type = 0 AND g2.agent_type != 0 AND g1.sim_time = 0.0