从 SQLite 上的 WITH 子句更新数据

Question

我有一个 table **属性 **，其中记录了 postgis 坐标列 geoarea（点）和布尔列 within_area(Bool) 确定它是否在另一个 postgis 的内部 st_union(Polygon) from table 市区

select properties.id, ST_Within(properties.geoarea,st_transform("urbanArea"."st_union",2393)) from properties,"urbanArea"

which returns 我通过 id 和 bool 值（如果它在区域内）的属性中的所有记录。执行查询大约需要 10 秒

我现在想从 select 语句中获取值并将其插入 within_area 专栏，我想出了这个 SQL 查询，但它永远挂起并且没有完成，知道为什么吗？

UPDATE properties p
SET  within_area = (
with newarea as (select properties.id, ST_Within(properties.geoarea,st_transform("urbanArea"."st_union",2393)) as "isInside" from properties,"urbanArea")
select u."isInside" from newarea u  where u.id = p.id
)

我也试过用 CTE 做，但它仍然永远挂起。

with newarea as (select properties.id, ST_Within(properties.geoarea,st_transform("urbanArea"."st_union",2393)) from properties, "urbanArea")
UPDATE properties
SET 
    withinurban=newa.st_within
FROM properties prop
INNER JOIN
newarea newa
ON prop.id = newa.id

Answer 1

在您的第二个查询中移除 properties 的额外连接：

WITH newarea AS (
  SELECT p.id, 
         ST_Within(p.geoarea, ST_Transform(u."st_union", 2393)) st_within
  FROM properties p, "urbanArea" u
)
UPDATE properties p
SET withinurban = n.st_within
FROM newarea n
WHERE p.id = n.id;

但是，您的代码似乎只相当于：

UPDATE properties p
SET withinurban = ST_Within(p.geoarea, ST_Transform(u."st_union", 2393))
FROM "urbanArea" u;

或：

UPDATE properties p
SET withinurban = ST_Within(p.geoarea, ST_Transform((SELECT "st_union" FROM "urbanArea"), 2393));

从 SQLite 上的 WITH 子句更新数据

Update data from a WITH clause on SQLite

sql

sqlite

join

sql-update

common-table-expression