mysql - 使用空间查询的结果更新 mysql 表

Question

我正在使用 mysql 来计算多边形特征（postsec）内的点特征（商店）的数量。

我的选择查询工作正常，但我想用生成的结果更新表 postsec。我的查询如下：

select pc_sec, count(*) as count from shops 
join postsec on st_within(shops.SHAPE,postsec.SHAPE) 
where shops.shop_cat > 0 and shop_cat < 10 group by pc_sec

我已经尝试了多种方法来执行此操作，例如 update postsec set new_column = ([select query]) 但似乎找不到正确的方法。

Answer 1

像这样的东西应该工作

update postsec 
inner join 
(
   select pc_sec, count(*) as pseccount 
   from shops 
   join postsec on st_within(shops.SHAPE,postsec.SHAPE) 
   where shops.shop_cat between 1 and 9
   group by pc_sec
) x on x.pc_sec = postsec.id
set count_column = x.pseccount