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By now, you should have the conceptual and logical model created that covers the data requirements for your database system. As we have discussed over the previous four chapters, our design so far needn't follow any strict format or method. It didn't have to be implementable, but it did have to cover the requirements that are data related. In some cases, the initial creator of the logical model may not even be a database professional, but a client who starts the model. Changes to the logical model meant changes to the requirements ...