0 - 2 of 2 tags for business

Dear All
I have stored information about company sales in a table tab_sales as follows:
Company Week         Date                 Sales
Co. 1        201237      10-09-12           $200
Co. 1        201237      12-09-12           $150
Co. 1        201237      14-09-12           $420

It was a complex Business Objects report with some > 30 joins and instead of coming up with some sort of Join Index recommendation I Wiz is asking me to drop a bunch of NUSI's that are'nt getting used and says it will improve the system performance 15%.