Beginning Visual Basic. NET databases by Denise Gosnell; Matthew Reynolds; Bill Forgey

By Denise Gosnell; Matthew Reynolds; Bill Forgey

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Whenever you enable cascade deletes, you should make doubly sure that it will have the effect you desire. Normalizing the Data Once your initial efforts have established likely keys and relationships for your tables, the next step in the logical database design is to normalize the data. Normalization is the process of simplifying the database design to achieve the optimum structure. The steps in this process are known as normal forms. These normal forms are a sequence of rules that are applied to progressively simplify a database design.

With clustered indexes, the data is physically stored in the table in the same order as the clustered index. This saves the database engine having to look up a location and then access that location in a second step to retrieve the information, as you would have to do with an index in a book, for example. There can only be one clustered index per table and it will commonly be defined on the primary key. There are certain situations where a clustered index will actually perform slowly – for example, when you make a lot of data inserts.

So, let's jump right in and take a look at the first three normal forms and start to apply their rules to our work-in-progress example. First Normal Form To achieve First Normal Form, we must eliminate any repeating groups. In First Normal Form, we simplify our database structure to eliminate any repeating groups. In other words, First Normal Form includes the concept that fields must be "atomic" or a field represents one type of value for all records. Examples of these repeating groups can be: ❑ A list of multiple values in the same field.

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