感谢@TimBiegeleisen的评论，我能够找到问题所在。我使用保留关键字（用户）作为列名。

Thanks to @TimBiegeleisen's comment, I was able to pinpoint the problem; I used a reserved keyword ("user") as a column name.

链接到文档中的保留关键字： https://www.postgresql.org/docs/current/sql-keywords-appendix.html 。

Link to reserved keywords in the doc: https://www.postgresql.org/docs/current/sql-keywords-appendix.html.

现在知道不要使用引号来查询列名，而要避免使用保留关键字作为列名。

Now I know not to use quotes to query column names, but rather to avoid reserved keywords as column names.