Ok, i can answer the question for how to make a query for this week.. but...
how do i select all records from last week?
Q: how would you make that query for 'this' week, and if you can do that, what's stopping you from doing the same for one week earlier?
here is a query for this week:
SELECT * FROM ISSUES WHERE WEEK(DATE_ADDED)=WEEK(NOW())
and i figured out the query for last week:
SELECT * FROM TABLE WHERE WEEK(DATE_ADDED)=WEEK(DATE_SUB(NOW(), INTERVAL 7 DAY))