postgresql – PGError：错误：列“p.name”必须出现在GROUP BY

SELECT p.name,p.id,SUM(hours) AS hours,SUM(logged_hours) AS logged_hours
    FROM (
        SELECT project_id,date,hours,null AS logged_hours
        FROM #{ScheduleEntry.table_name}
        WHERE user_id = #{User.current.id}
            AND date BETWEEN '%s' AND '%s'
        UNION
        SELECT project_id,spent_on AS date,null AS hours,sum(#{TimeEntry.table_name}.hours) AS logged_hours
        FROM #{TimeEntry.table_name}
        WHERE user_id = #{User.current.id}
            AND spent_on BETWEEN '%s' AND '%s'
        GROUP BY project_id,date
    ) AS results
    LEFT JOIN #{Project.table_name} AS p ON p.id = results.project_id
    GROUP BY project_id