Add shopping cart to wordpress

Our company plan build a web site, the site include CMS feature( Add Post by categories) and shopping card feature.

Do you think if one WP application can do both? Please give me some advice which shopping cart plugins are good for this.

I need the shop cart do not affect wp_posts table because we also need the feature. I wonder if the shopping cart plugin can add some new tables to default WP application.

Thanks for help

Mark

via Chebli Mohamed