Designing effective database systems by Rebecca M. Riordan

By Rebecca M. Riordan

World-renowned professional Rebecca M. Riordan has written the definitive database layout publication for operating builders who aren't database specialists. regardless of how messy or advanced what you are promoting problem, Designing potent Database structures exhibits you ways to layout an efficient, high-performance database to resolve it.Riordan starts by way of completely demystifying the rules of relational layout, making them obtainable to each expert developer. subsequent, she deals the field's clearest creation to dimensional database modeling: sensible perception for designing modern more and more vital analytical functions. One job at a time, Riordan illuminates each part of database research and layout for either OLAP and OLTP, displaying how you can steer clear of universal architectural pitfalls that complicate improvement and decrease extensibility. The ebook concludes with entire, professional counsel on designing databases for optimum usability.

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Example text

But the reverse is not true. Having identified an entity on the one side of the relationship, you can't select a single entity on the many side. This is the problem with Figure 3-17. Knowing an OrderDetails item, you can determine the product, but knowing the product, you can't determine to which SupplierProducts entity it's linked. An easy way to think of this is that you can't change direction from one-to-many to many-to-one more than once in a relationship chain. The chain in Figure 3-16 changes direction only once, at OrderDetails.

In other words, you add the attributes that make up the candidate key in the primary relation to the foreign relation. Not surprisingly, the duplicated attributes become known as the foreign key in the foreign relations. In the example shown in Figure 3-3, OrderIDthe candidate key of the Orders relationhas been added to the OrderDetails relation. Orders is the primary relation, and OrderDetails is the foreign relation. Note that the candidate key/foreign key pair that models the relationship need not be the primary key of the primary table; any candidate key will serve.

The entity on the one side of the relationship is always the primary relation; its candidate key is copied to the relation on the many side, which becomes the foreign relation. The candidate key of the primary relation often forms part of the candidate key for the relation on the many side, but it can never uniquely identify the tuples of foreign relation by itself. It must be combined with one or more other attributes to form a candidate key. Many-to-Many Relationships Many-to-many relationships exist aplenty in the real world.

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