Postgres ON CONFLICT 设置列引用不明确 [英] Postgres ON CONFLICT set column reference is ambiguous

问题描述

我有一张桌子:

create table c (
    e text not null,
    m text not null,
    p numeric not null,
    PRIMARY KEY (e, m)
);

我想做插入或更新，将 p 添加到现有值:

and I want to do insert or update that adds p to existing value:

insert into c values (...) on conflict (e, m) do update set
            p = p + excluded.p

然后我得到一个错误:

错误:列引用p"不明确

ERROR: column reference "p" is ambiguous

它是如何模棱两可的?我应该如何编写插入以将 excluded.p 添加到现有值?

how it's ambiguous? how should i write my insert to add excluded.p to the already existing value?

推荐答案

好吧，你可能想要:

        p = c.p + excluded.p

您可能想要:

        p = excluded.p + excluded.p

您需要指定.

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