Database Schemas Data independence (logical and physical). Entity Relationship Model (ERM). High level database design Conceptual schemas. Verification – give the user what he wants. Validation – the requirements are consistent. Related PostsOperations on RelationsHigh Level Database DesignTransparencies IssuesOperators: Projection (unary)Top-Down Design kaizenlogadmin (2959 Posts)I am Peter, a blogger, SEO and social media person who has an interest in E-commerce, ERP and CMS systems. You can contact me by e-mail: kaizenlog@gmail.comShare this:EmailFacebookTwitterGoogle +1LinkedInStumbleUponRedditPinterestTumblrPrintDigg