sql - 删除 INSERT SELECT 语句中的重复查询

Question

我有一个查询，它通过 INSERT SELECT 语句将数据从任务表插入到 Clockify 表中。

ALTER procedure [dbo].[ClockifyAdd]  
 AS  
 BEGIN  
       insert into Clockify(ClockifyId,DurationInMinutes,Date)
         SELECT 
              ClockifyId
            , SUM(DATEDIFF(mi, CAST(StartTime AS datetime), CAST(EndTime AS 
               datetime))) AS DurationInMinutes
            , CAST(StartTime AS date) AS Date
        FROM Task
        GROUP BY
              ClockifyId
            , CAST(StartTime AS date)
END  

问题是在插入 Clockify 表时，我不想插入重复项并在此处进行检查。我有一个删除重复项的存储过程，但我想要一种更好的方法，即在插入时必须检查重复项，如果有重复项，则不得插入。请查看图片以获得更好的理解提前感谢您的回复并花费您宝贵的时间来解决此问题。 在此处输入图像描述

Answer 1

您可以检查值是否已经存在 uning a left join anche check for null value

insert into Clockify(ClockifyId,DurationInMinutes,Date)
     SELECT 
          Task.ClockifyId
        , SUM(DATEDIFF(mi, CAST(Task.StartTime AS datetime), CAST(Task.EndTime AS 
           datetime))) AS DurationInMinutes
        , CAST(Task.StartTime AS date) AS Date
    FROM Task
    LEFT JOIN Clockify 
        ON Task.ClockifyId = Clockify.ClockifyId 
            AND Task.Date = Clockify.Date
    WHERE Clockify.ClockifyId Is NULL
    GROUP BY
          Task-ClockifyId
        , CAST(Task.StartTime AS date)

Answer 2

你可以使用 not exists 如下：

 insert into Clockify(ClockifyId,DurationInMinutes,Date)
         select t.* from
          (SELECT 
              ClockifyId
            , SUM(DATEDIFF(mi, CAST(StartTime AS datetime), CAST(EndTime AS 
               datetime))) AS DurationInMinutes
            , CAST(StartTime AS date) AS Date
        FROM Task
        GROUP BY
              ClockifyId
            , CAST(StartTime AS date) ) t
     where not exists 
           (select 1 from Clockify c 
            where c.ClockifyId = t.ClockifyId
              and c.DurationInMinutes = t.DurationInMinutes
              and c.Date = t.Date) 
    -- remove the condition on column from here if you don't want to 
    -- consider column for finding duplicate