Hey there, If you have a website that has product details page. You do something like.. viewDetails.cfm?productID=123 viewDetails.cfm?productID=456 viewDetails.cfm?productID=789 Do search engines see this as three different pages? A few weeks ago I submitted a sitemap to google for a real estate website, and it says over 18,000 links were submitted because of the detail pages. Sincerely, Travis Walters
Google Webmaster's guideline says that you should not have many query parameters...so I would say as long as the qry parameters are 1 or 2, you are fine.
google can differentiate those pages but query string in url is not seo friendly. i had work on some big dynamic sites before and i had done mode rewrite in .htaccess file. that is one of the best solution
I don't think it's the query string that makes it not to be SEO friendly, it's the way the query string is populated. If you have a unique name for each product and use that in your query string, instead of the productID, the query sting will be much more SEO friendly. Though I'd still limit the query string to two query parameters.