postgresql：在列更新中分组 - 语法错误

Question

我试图获取每个区域最高点的高度，我写了这个查询，它运行良好：

select max(obstacle.valhgt_ft) 
from obstacle,
     obstacle_buffer 
where st_contains (obstacle_buffer.geom,obstacle.geom) 
group by obstacle_buffer.primary_id

但是当我尝试使用此查询更新属性时，我在 "group"

附近遇到语法错误

UPDATE obstacle_buffer 
    SET max_valhgt_ft = max(obstacle.valhgt_ft) 
from obstacle,
     obstacle_buffer 
where st_contains (obstacle_buffer.geom,obstacle.geom) 
group by obstacle_buffer.primary_id

Answer 1

您尝试更新连接 table 但不允许您应该改用子查询

你可以做到这一点

UPDATE obstacle_buffer 
SET max_valhgt_ft = (select max(obstacle.valhgt_ft) 
                     from obstacle,obstacle_buffer 
                     where st_contains (obstacle_buffer.geom,obstacle.geom) 
                     group by obstacle_buffer.primary_id)

Answer 2

您可以使用相关子查询来执行此操作：

UPDATE obstacle_buffer 
    SET max_valhgt_ft = (select max(obstacle.valhgt_ft) 
                         from obstacle 
                         where st_contains (obstacle_buffer.geom, obstacle.geom))

postgresql：在列更新中分组 - 语法错误

postgresql: group by in column update - syntax error

postgresql

postgis

group-by

sql-update