Query Problem : Select The Record From Last 7days

May 9, 2008

I've have these following table

tbllocation
Main_ID | Date_Taken | Time |Hit
-----------------------------------------
206 | 5/9/2008 | 100 | 2
206 | 5/9/2008 | 200 | 3
206 | 5/6/2008 | 300 | 6
201 | 5/1/2008 | 400 | 5
201 | 5/4/2008 | 500 | 9
201 | 5/7/2008 | 600 | 2
204 | 5/2/2008 | 700 | 2
204 | 5/3/2008 | 800 | 4
204 | 5/6/2008 | 900 | 2
203 | 5/7/2008 | 100 | 2
203 | 5/8/2008 | 200 | 3
203 | 5/9/2008 | 300 | 6
202 | 5/4/2008 | 400 | 5
202 | 5/3/2008 | 500 | 9
202 | 5/8/2008 | 200 | 3
205 | 5/2/2008 | 300 | 6
205 | 5/1/2008 | 400 | 5
205 | 5/9/2008 | 500 | 9

tblSetValue
Main_ID | Hit2
---------------
206 | 3
201 | 5
204 | 3
203 | 1
202 | 8
205 | 7
*Main_ID is a primary key

Condition
1. Let's say, the current date is 5/9/2008
2. Result only display the last 7 days data. From above data. it's mean only pickup from 5/3/2008 to 5/9/2008
3. Every Main_ID only pickup the MAX Hit
4. Diff (column on the fly) = Hit - Hit2

The expected result shown as follow
tblResult
Main_ID | Date_Taken | Time | Hit | Hit2 | Diff
-----------------------------------------------
206 | 5/6/2008 | 300 | 6 | 3 | 3
201 | 5/4/2008 | 500 | 9 | 5 | 4
204 | 5/3/2008 | 800 | 4 | 3 | 1
203 | 5/9/2008 | 300 | 6 | 1 | 5
....
....
....

Anyone can help me to show the query?

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