eBay interview questions and answers

1. Let’s say you have 100,000 records and you want to delete 95,000 at a time and keep only 5 thousand. But in local memory you don’t have enough space for 95,000 records. What do you do in this case? How do you delete without any problem with time and performance?
2. I need data on eBay customers in Chicago who can did bid on certain item? I dont have access to eBay database directly. How I get the information?
3. With DTS packaging I can store tables in Excel and convert them back to SQL. But once I copied tables to Excel I want to modify some info. How you do that without editing the Excel file?
4. What is cursor and where do you use them?