sql - 使用 WITH 子句查询时出现 Postgres "missing FROM-clause entry"错误

Question

我正在尝试在 Postgres 9.1.3 中使用此查询:

WITH stops AS (
    SELECT citation_id,
           rank() OVER (ORDER BY offense_timestamp,
                     defendant_dl,
                     offense_street_number,
                     offense_street_name) AS stop
    FROM   consistent.master
    WHERE  citing_jurisdiction=1
)

UPDATE consistent.master
SET arrest_id = stops.stop
WHERE citing_jurisdiction=1
  AND stops.citation_id = consistent.master.citation_id;

我收到这个错误:

ERROR:  missing FROM-clause entry for table "stops"
LINE 12: SET arrest_id = stops.stop
                         ^

********** Error **********

ERROR: missing FROM-clause entry for table "stops"
SQL state: 42P01
Character: 280

我真的很困惑。根据 Postgres 文档，WITH 子句看起来是正确的。如果我在 WITH 子句中单独运行查询，我会得到正确的结果。

Answer 1

来自fine manual :

There are two ways to modify a table using information contained in other tables in the database: using sub-selects, or specifying additional tables in the FROM clause.

所以你只需要一个 FROM 子句:

WITH stops AS (
    -- ...
)
UPDATE consistent.master
SET arrest_id = stops.stop
FROM stops -- <----------------------------- You missed this
WHERE citing_jurisdiction=1
  AND stops.citation_id = consistent.master.citation_id;

错误消息甚至说了同样多的话:

ERROR: missing FROM-clause entry for table "stops"