db scheme question...

[eluser]crumpet[/eluser]
Hi, I am working with a website where there are many different content types ie survey, article, news, etc. I want each of these to have a comments feature. Is there any problem with creating one comments table which has a field called type (survey, article, news) and then parentID and then comment ID. This way I dont have to create a comments table for every single content type.

Any problems that you can for see with this approach ? will it be slow?

Thanks,