Postgresql upsert在冲突时返回id？

Question

我现在有以下查询，它会在成功插入后返回id

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如何让它返回冲突中已经存在的行的INSERT INTO match (match_id) values(?) ON CONFLICT DO NOTHING RETURNING id ？

Answer 1

使用ON CONFLICT DO UPDATE来确保查询在一行上运行，因此可以返回一些内容：

CREATE TABLE match(id serial PRIMARY KEY);

INSERT INTO match (id) VALUES (1)
ON CONFLICT (id) DO UPDATE
  SET id = excluded.id
RETURNING id;