将聚合函数与 SWITCH Access SQL 一起使用

Question

在我尝试了所有可能的方法后，我的 MS Access SQL 查询一直遇到此错误。

您的查询不包括指定的表达式 'SWITCH(b.STD > dateadd("h",1,a.STA), INT(SUM(a.blocktime + b.blocktime + ( a.std - b. sta )) * 24) , (b.STD

代码如下：

SELECT SWITCH(b.STD > dateadd("h",1,a.STA),  
                INT(SUM(a.blocktime + b.blocktime + ( a.std - b.sta )) * 24), 
                (b.STD <= dateadd("h",1,a.STA) AND b.STD <= #02:00:00#),  
                INT(SUM(a.blocktime + b.blocktime + (Dateadd("d", 1, a.std) - b.sta )) * 24)   ) AS [Blocktime]

  FROM TempFinal a Inner JOIN TempFinal b
ON (a.Dest = b.Orig)

Group By

(a.blocktime + b.blocktime + ( a.std - b.sta )),   
(a.blocktime + b.blocktime + (Dateadd("d", 1, a.std) - b.sta ));

我知道问题出在 Group By 部分，但我无法让它发挥作用。奇怪的是前几次运行的确切代码，然后在我保存后我无法再让它恢复工作。

请帮我解决问题。

非常感谢！

Answer 1

正如你所说，你知道错误是按部分分组的。

尝试将您的计算放在子查询中，并将分组放在主查询中。这将解决您的问题。

它看起来像这样：

SELECT SUM(c.Blocktime)
FROM
(SELECT SWITCH(b.STD > dateadd("h",1,a.STA),  
                INT(a.blocktime + b.blocktime + ( a.std - b.sta ) * 24), 
                (b.STD <= dateadd("h",1,a.STA) AND b.STD <= #02:00:00#),  
                INT(a.blocktime + b.blocktime + (Dateadd("d", 1, a.std) - b.sta ) * 24)   ) AS [Blocktime], (a.blocktime + b.blocktime + ( a.std - b.sta )) As GroupA, (a.blocktime + b.blocktime + (Dateadd("d", 1, a.std) - b.sta )) AS GroupB

  FROM TempFinal a Inner JOIN TempFinal b
ON (a.Dest = b.Orig)) AS c
GROUP BY c.GroupA, c.GroupB