Table Organization Help Requested

Aug 31, 2007

I have at least 200 excel spreadsheets that get updated every day with closing prices of commodities. I want to run a breakout query against every spreadsheet to see if today's close is a new 20 day breakout. What is the best way to organize the access table or tables? Put all the data in one table or have separate tables for each contract and run one query against the group? I need to be able to update the tables everyday so that today's close info is included. I have a working query that works with a single dynamically linked spreadsheet to table, but I don't want to set this up for all 200 spreadsheets. Can this process be duplicated? I have tried to modify the query to run against two separate tables, but was unsuccessful. Since there are so many potential tables, if that is the best way to do it, how can you say select all tables and then run the query?

Here is the query I have written:

SELECT WZ07.Symbol, WZ07.AlphaDeliveryMonth, DateSerial(Val(Left([ddate],4)),Val(Mid([ddate],5,2)),Val(Right([ddate],2))) AS transdate, WZ07.DClose
FROM WZ07
WHERE (((DateSerial(Val(Left([ddate],4)),Val(Mid([ddate],5,2)),Val(Right([ddate],2)))) Between Date()-28 And Date()-1) AND ((WZ07.DClose)=(select max([WZ07].DClose) from [WZ07])));

The WZ07 is the December Wheat contract for 2007. This is what the excel spreadsheets are named. I had to do a dateserial command to turn a number into a date(couldn't make access recognize that 20070831 was August 31,2007) All the column headings on all the spreadsheets are the same: Symbol, AlphaDeliveryMonth, DDate(transdate),Close

I know that this is both about tables and queries so I wasn't sure where to post this. Thanks for your help.

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