使用原始SQL SELECT语句时出现语法错误

Question

我不知道为什么我得到语法错误，根据this question一切都应该没问题。我找不到一种方法来执行window function（postgres查询返回多个列GROUPED BY和个人列），这就是我使用原始SQL的原因。

我对Postgres仍然很陌​​生，但我认为它可能与消毒有关，但我也不知道该怎么去做。任何帮助将不胜感激，这里是我的代码：

module TasksTestQuery 

    def self.call 

    query = "SELECT user_id, username, date, SUM(user_id) AS total_work, SUM(duration) AS total_duration OVER (PARTITION BY user_id) FROM tasks" 

    ActiveRecord::Base.connection.find_by_sql(query) 

    end 
end 

我得到确切的错误是：

ActiveRecord::StatementInvalid 
PG::SyntaxError: ERROR: syntax error at or near "(" LINE 1: SELECT user_id, username, date, SUM(user_id) AS total_work, SUM(duration) AS total_duration OVER (PARTITION BY user_id) FROM tasks 

Answer 1

应该

SUM(duration) OVER (PARTITION BY user_id) AS total_duration