Question

我想我失去了它，任何人都可以解释为什么我会遇到以下情况：这是我的疑问：

    update financials.operator_summary_daily set
        osm_fos_id = fos_id
    from financials.operator_summary_daily daily
    join (
        select 
            osm_id,
            fos_id
        from financials.operator_summary_daily daily
        join financials.operator_settlement_monthly on daily.osm_opt_id = fos_opt_id and date_trunc('month', daily.osm_timestamp)::timestamp = date_trunc('month', fos_timestamp)::timestamp --and daily.osm_fos_id is null
    ) as result on result.osm_id = daily.osm_id

内部查询返回1963条记录，但更新将在financials.operator_summary_daily的整个表上执行，并更新所有39条记录。

我在这里缺少什么？

表：

CREATE TABLE financials.operator_summary_daily
(
  osm_id bigint NOT NULL DEFAULT nextval('financials.operator_summary_monthly_osm_id_seq'::regclass),
  osm_timestamp timestamp without time zone NOT NULL,
  osm_opt_id bigint NOT NULL,
  osm_gam_id bigint NOT NULL,
  osm_cur_id bigint NOT NULL,
  osm_ctt_id bigint NOT NULL,
  osm_turnover double precision NOT NULL,
  osm_revenue double precision NOT NULL,
  osm_timestamp_created timestamp without time zone NOT NULL DEFAULT now(),
  osm_timestamp_updated timestamp without time zone NOT NULL DEFAULT ('now'::text)::date,
  osm_fos_id bigint
);


CREATE TABLE financials.operator_settlement_monthly
(
  fos_id bigserial NOT NULL,
  fos_timestamp timestamp without time zone NOT NULL, -- Monthly timestamp
  fos_opt_id bigint NOT NULL,
  fos_royalties double precision NOT NULL,
  fos_carry_over double precision NOT NULL,
  fos_other_adjustments double precision NOT NULL,
  fos_due double precision NOT NULL,
  fos_collectable double precision NOT NULL,
  fos_balance double precision NOT NULL,
  fos_collected double precision NOT NULL,
  fos_baddebt double precision NOT NULL,
  fos_carryforward double precision NOT NULL,
  fos_ses_id bigint NOT NULL,
  fos_timestamp_created timestamp without time zone NOT NULL DEFAULT now(),
  fos_datetime_updated timestamp without time zone NOT NULL DEFAULT now(),
  fos_prq_id bigint
);

编辑：
感谢您的快速解答，但是不应该需要一个地方，连接条件不是LEFT，它是包含的，并且应该只渲染匹配的更新行。因此，应更新37K中的1963个记录（满足连接标准的记录）。我错了吗？

解答：正确的脚本：

    UPDATE financials.operator_summary_daily d
    SET    osm_fos_id = m.fos_id
    FROM   financials.operator_settlement_monthly m
    WHERE  
        m.fos_opt_id = d.osm_opt_id
        AND    date_trunc('month', d.osm_timestamp) = date_trunc('month', m.fos_timestamp)
        AND d.osm_fos_id is null;

谢谢@ErwinBrandstetter。显然，我一直在为JOIN使用错误的假设，我的背景是MS-SQL，它在那里工作方式不同。通过查看最终解决方案，JOIN被完全删除并通过直接调用辅助表进行交换，这是T-SQL无法做到的。

顺便说一下，以下内容不起作用，它确实包含了其他评论建议的where子句。在更新记录时，我仍然对pgsql如何处理JOIN感到困惑。

    update financials.operator_summary_daily set
        osm_fos_id = fos_id
    from financials.operator_summary_daily daily
    join (
        select 
            osm_id,
            fos_id
        from financials.operator_summary_daily daily
        join financials.operator_settlement_monthly on daily.osm_opt_id = fos_opt_id and date_trunc('month', daily.osm_timestamp)::timestamp = date_trunc('month', fos_timestamp)::timestamp 
    ) as result on result.osm_id = daily.osm_id
    where
        daily.osm_id = result.osm_id
        and daily.osm_fos_id is null;

复杂的连接是我试图确保内部查询只返回整个表的一个子集的结果，用于＆＃34;调试＆＃34;目的。

再次感谢！

Answer 1

您的更新没有WHERE条件。

此语句将更新all行。

您的陈述可能会像这样（非常简化）：

UPDATE financials.operator_summary_daily d
SET    osm_fos_id = m.fos_id
FROM   financials.operator_settlement_monthly m
WHERE  m.fos_opt_id = d.osm_opt_id
AND    date_trunc('month', d.osm_timestamp) = date_trunc('month', m.fos_timestamp)
-- AND daily.osm_fos_id is null -- ?? Why is this here / commented out?

Answer 2

您没有链接到表的WHERE子句要更新为FROM之后的查询结果

您需要执行类似

的操作

update financials.operator_summary_daily set
    osm_fos_id = fos_id
from financials.operator_summary_daily daily
join (
    select 
        osm_id,
        fos_id
    from financials.operator_summary_daily daily
    join financials.operator_settlement_monthly on daily.osm_opt_id = fos_opt_id and date_trunc('month', daily.osm_timestamp)::timestamp = date_trunc('month', fos_timestamp)::timestamp --and daily.osm_fos_id is null
) as result on result.osm_id = daily.osm_id
WHERE daily.osm_id = financials.operator_summary_daily.osm_id -- condition to link

使用内部查询更新（加入）

2 个答案: