Using Aggregate function with SWITCH Access SQL

Question

My MS Access SQL Query is keep running into this error after I tried every way possible.

Your query does not include the specified expression '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 part of an aggregate function

Here is the code :

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 ));

I knew the problems lies within the Group By part, but I can't get it to work. The strange thing here is the exact code worked for the first few run, then after I saved it I can't get it back to work anymore.

Please help me fix the problem.

Thank you very much!

Answer 1

As you say, you know the error is in the group by part.

Try putting your calculations in a subquery, and the grouping in the main query. This will fix your problem.

It will look something like this:

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