查询服务表现问题

Question

使用Access 2003

查询

SELECT t1.PERSONID  ,t1.CARDEVENTDATE 
     ,MIN(t2.CARDEVENTTIME) AS Intime 
     ,MAX(t3.CARDEVENTTIME) AS Outtime, 
Min(t3.Cardeventtime) as BreakOut, 
Max(t4.CardEventTime) as BreakIn 

FROM ((( SELECT PERSONID 
       , CARDEVENTDATE 
         FROM T_CARDEVENT) as t1 
LEFT OUTER JOIN (SELECT PERSONID 
           ,CARDEVENTDATE, FUNCTION 
            , CARDEVENTTIME 
         FROM T_CARDEVENT WHERE (FUNCTION = 'A')) as t2 
ON t1.PERSONID = t2.PERSONID 
      AND t1.CARDEVENTDATE = t2.CARDEVENTDATE) LEFT OUTER JOIN (SELECT PERSONID 
           ,CARDEVENTDATE, FUNCTION 
            , CARDEVENTTIME 
         FROM T_CARDEVENT WHERE (FUNCTION = 'D')) as t3 
ON t1.PERSONID = t3.PERSONID 
      AND t1.CARDEVENTDATE = t3.CARDEVENTDATE) LEFT OUTER JOIN (SELECT PERSONID 
           ,CARDEVENTDATE, FUNCTION 
            , CARDEVENTTIME 
         FROM T_CARDEVENT WHERE (FUNCTION = 'B')) as t4 
ON t1.PERSONID = t4.PERSONID 
      AND t1.CARDEVENTDATE = t4.CARDEVENTDATE) LEFT OUTER JOIN (SELECT PERSONID 
           ,CARDEVENTDATE, FUNCTION 
            , CARDEVENTTIME 
         FROM T_CARDEVENT WHERE (FUNCTION = 'C')) as t5 
ON t1.PERSONID = t5.PERSONID 
      AND t1.CARDEVENTDATE = t5.CARDEVENTDATE 

      GROUP BY t1.PERSONID, t1.CARDEVENTDATE 

当我运行上面的查询，它正在采取太多的时间来查看结果，所以有时它是显示错误消息“还不够在内存中的临时空间“

有任何其他的方式来访问这样的查询。

需要查询帮助

Answer 1

您的查询是一个烂摊子......我不知道你打算做..所以这里有一些乱撞，在回答中，而不是评论的形式是什么..但因为所有的连接被左外连接我无法格式化的意见..

..

我建议你尝试玩这个：通过CARDEVENT一组：

select FUNCTION 
    , PERSONID 
    , min(cardeventdate) 
    , max(cardeventdate) 
    from T_CARDEVENT 
where FUNCTION in ('A','B','C','D') 
group by FUNCTION,PERSONID 

PS （对我来说）DATE和最小/最大值在同一领域没有多大意义。