查询性能问题

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时，查看结果需要花费太多时间，所以它显示的错误信息是“内存中没有足够的临时空间”

在访问中可以使用任何其他方式进行此类查询。

需要查询帮助

Answer 1

你的查询很乱......我不确定你打算做什么..所以这里有一些猜测，以答案的形式而不是评论..但我不能格式化评论..

因为所有联接都是左外连接..

我建议你尝试玩这个：

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

PS：在同一领域的CARDEVENTDATE和min / max组合对我来说没有多大意义。