4表的SQL联合

Question

我有4个不同的表：

• 地址：address_id，邮政编码。
• 患者：address_id，姓名。
• FocusArea：geom。
• 邮政编码：geom，邮政编码。

我需要找到关注区域内患者的姓名。

我已经设法获得了患者居住的邮政编码以及重点区域内的邮政编码，但是我不知道如何将这两个查询结合起来：

SELECT 
    air.address.postcode, air.patient.name
FROM 
    air.address 
INNER JOIN 
    air.patient ON patient.address_id = address.address_id;

SELECT 
    postcode as postcode
FROM 
    air.postcode, air.focusarea
WHERE
    air.focusarea.objectid = 1 
    AND ST_Intersects(air.postcode.geom, air.focusarea.geom);

air.focusarea.objectid = 1因为焦点区域有不同的边界。

有任何想法吗？

谢谢

塔尼亚

Answer 1

select
   a.postcode, p.name
from air.address as a
    inner join air.patient as p on
        p.address_id = a.address_id
    inner join air.postcode as pc on
        pc.postcode = a.postcode
    inner join air.focusarea as fa on
        fa.objectid = 1 and
        ST_Intersects(pc.geom, fa.geom);