我正在使用 mysql 来计算多边形要素(postsec)内点要素(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
我尝试了多种方法来做到这一点,例如update postsec set new_column = ([select query]) 但似乎找不到正确的方法。
最佳答案
这样的东西应该有效
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
关于mysql - 使用空间查询的结果更新 mysql 表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20924442/