使用WITH子句查询时发生Postgres“从Fissing子句输入”错误

Question

我试图在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;

我收到此错误：

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子句显示正确。如果我在WITH子句中单独运行查询，则会得到正确的结果。

Answer 1

从精美的手册中：

有两种方法可以使用数据库中其他表中包含的信息来修改表：使用子选择，或在FROM子句中指定其他表。

因此，您只需要一个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;

错误消息甚至说了很多：

错误：缺少表“ stops”的FROM子句条目