Can this code get speeded up

[mahmed1]

Hiya

I've got this SQL statement in excel to pull back data from access into my excel sheet

This works fine but takes around 10-12 minutes to run each time and was hoping i can speed this up...I believe it may be the join or the In statement that makes it take long

Hopefully you can help me speed it up

  SQLQuery = "SELECT t.Date AS [Date], t.Department AS Department, SUM(t.Requested) AS Requested, SUM(t.Connected) AS Connected, SUM(t.Requested) - SUM(t.Connected) AS Abandoned, MAX(ROUND(IIF(Requested > 0, Connected/Requested, 0), 2)) AS PWA, SUM(t.THT)/SUM(IIF(t.Connected>0,t.Connected,9.999999E+306)) AS AHT, SUM(t.TSA)/SUM(IIF(t.Connected>0,t.Connected,9.999999E+306)) AS ASA" & _

                        " FROM (SELECT roll.DATE AS [Date], lkup.Department As Department, IIF(SUM(roll.[REQUESTED CHATS])>0,SUM(roll.[REQUESTED CHATS]),0) AS Requested, IIF(SUM(roll.[CONNECTED CHATS])>0, SUM(roll.[CONNECTED CHATS]),0) AS Connected, SUM(roll.THT) AS THT, SUM(roll.TSA) AS TSA" & _

                        " FROM tbl_WebChatRolling AS roll INNER JOIN lookup_WebChat AS lkup ON lkup.Skill = roll.SKILL" & _
                        " WHERE roll.DATE Is Not Null And lkup.Department In " & Zx & " And ([Date] Between #" & fromDate & "# And #" & toDate & "#) And ((CStr(Format(roll.HOUR, 'hh:mm')) IN ('08:00',   '09:00', '10:00', '11:00', '12:00', '13:00', '14:00', '15:00', '16:00', '17:00', '18:00', '19:00', '20:00')) AND (CStr(Format(roll.Date, 'ddd')) IN ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat')))" & _
                        " GROUP BY roll.DATE, lkup.Department" & _
                        " ORDER BY lkup.Department, roll.DATE" & _

                        " UNION ALL" & _

                        " SELECT roll.DATE AS [Date], lkup.Department AS Department, IIF(SUM(roll.[REQUESTED CHATS])>0,SUM(roll.[REQUESTED CHATS]),0) AS Requested, IIF(SUM(roll.[CONNECTED CHATS])>0, SUM(roll.[CONNECTED CHATS]),0) AS Connected, SUM(roll.THT) AS THT, SUM(roll.TSA) AS TSA" & _

                        " FROM tbl_WebChatRolling AS roll INNER JOIN lookup_WebChat_Night AS lkup ON lkup.Skill = roll.SKILL" & _
                        " WHERE roll.DATE Is Not Null And lkup.Department In " & Zx & " And ([Date] Between #" & fromDate & "# And #" & toDate & "#) And ((CStr(Format(roll.HOUR, 'hh:mm')) IN ('00:00', '01:00', '02:00', '03:00', '04:00', '05:00', '06:00', '07:00', '21:00', '22:00', '23:00')) OR (CStr(Format(roll.Date, 'ddd')) IN ('Sun')))" & _
                        " GROUP BY roll.DATE, lkup.Department)  AS t" & _
                        " GROUP BY t.Date, t.Department" & _
                        " ORDER BY t.Date, t.Department"

 

[welshgasman]

Do you have indices for the relevant fields?

 

[mahmed1]

Hiya - this wasnt set up by me but i can see no index - what fields would i need to add an index on to make it quicker and do i need to add index to query?

 

[mahmed1]

I added indexes to Date and Skill with allowing dups and then also added index on the skill on lookup table with no dups and this has speeded up big time by under a couple of mins - Thank you