Designing the Product Tables part- 1: Finally, the previous table makes no accommodation for the fact that more than one type of tax may be applicable to a particular product. However, in the real world, it’s quite possible, for example, for state and local taxes both to be applied to a product, or for both local taxes and cross-border duties to be levied on products transported across borders.
Structure is far superiorly considered, when it separates tax information from product information. Because the repeated tax values are now represented through foreign key relationships (which use integers instead of text strings), the previous tables save space, and are also more compact and easier to understand. Finally, the establishment of a many-to-many relationship between products and taxes through a third link table makes it possible to apply multiple taxes to a single product, or to have the same tax levied on multiple products.
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Creating Optimized Database design: Table structure, branch offices and customers are treated as though they were synonymous. Because there’s no real differentiation between a customer and a customer’s facilities, it is not possible to obtain an exact count of the business’s customers. Thus, even though the previous table contains four records, in reality there are only two customers: ABC Inc. and Zee Corp. Further, if ABC Inc. alters its name, each record for ABC Inc.’s branches will have to be updated, as the name is repeated in each. A single field for addresses means that state and PIN code data is intermingled with street and building names. If the business plans to query on the basis of geographical region-say, to evaluate how many customers it has in each state or to find out which locations should be targeted in advertising—the business will find both extracting state names and pin codes from the previous table, and sorting and comparing the records by region extremely hard.
