The External Model concerns itself with only the portions of the database that can end user can interact with. What if multiple groups of End Users (such as the Marketing Department and the Account Department) share a few tables. What issues could arise if one group makes a change that impacts another. What are some ideas you can come up with avoid this

Which database model is best used for data warehouse and data mining

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How to launch an app: steps to be successful? launching an app is a great idea, but it’s not that easy as we supposed to think. the majority of mobile applications don’t generate revenue because companies aren’t ready to be competitive. referring to our experience in successfully building and launching apps we hope to you omit these difficulties. we are going to talk about ideas, marketing, testing your product, its development, distribution and support. you will learn 8 product launch stages to succeed.