LifeinAsia - 9:51 pm on Apr 26, 2011 (gmt 0)
Depending on your DB, you should have a tool or command to import a CSV file into a table.
If it's an ongoing project (with the retailer frequently updating their product feed), you may want to automate the process. You could do it with a scheduled task in the DB or application server (PHP, ASP, etc.).