Postgresql列必须出现在GROUP BY子句中，或者在聚合函数中使用

Question

我正在尝试编写一个脚本，该脚本需要每小时平均一次的系列数据。即我每隔5分钟就有5年的数据，但我需要5年的小时平均值。 Postgresql似乎在抱怨已经在那里的group by子句中缺少列？我在这里犯了什么男生错误？

 SELECT
    time_audit_primary.clockyear,
    time_audit_primary.clockmonth,
    time_audit_primary.clockday,
    time_audit_primary.clockhour,

    AVG (time_audit_primary.time_offset) AS timeoffset,
    AVG (time_audit_primary.std_dev) AS std_dev

    FROM  tempin.time_audit_primary 

    GROUP BY (time_audit_primary.clockyear,
            time_audit_primary.clockmonth,
            time_audit_primary.clockday,
            time_audit_primary.clockhour)

Answer 1

它是导致错误的group by列周围的括号。只需删除它们：

SELECT
    time_audit_primary.clockyear,
    time_audit_primary.clockmonth,
    time_audit_primary.clockday,
    time_audit_primary.clockhour,

    AVG (time_audit_primary.time_offset) AS timeoffset,
    AVG (time_audit_primary.std_dev) AS std_dev

    FROM  tempin.time_audit_primary 

    GROUP BY time_audit_primary.clockyear,
            time_audit_primary.clockmonth,
            time_audit_primary.clockday,
            time_audit_primary.clockhour