By Rebecca M. Riordan
Simply because they are so advanced, many books on relational databases are both burdensomely educational (Database administration platforms is the vintage instance of this mode - it truly is marvelous, yet one essentially wishes a professor that can assist you decode it) or so practical-minded as to be overly uncomplicated. Designing Relational Database structures has struck an enticing stability among the 2 extremes by means of offering adequate conception to show you how to layout your databases intelligently, whereas preserving in brain real-world enterprise practices and the sensible boundaries of tangible database administration systems.Author Rebecca Riordan emphasizes Microsoft database items to a small measure, utilizing Microsoft entry and the Jet engine in a few of her examples. The Microsoft overtones should not overpowering, in any way.
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Additional info for Designing Relational Database Systems
Equally importantly, SQL Server will prohibit comparison between fields declared against different UDDTs, even when the UDDTs in question are based on the same system data type. For example, even though the CityName domain and the CompanyName domain are both defined as being char(30), SQL Server would reject the expression CityName = CompanyName. This can be explicitly overridden by using the convert function CityName = CONVERT(char(30), CompanyName), but it's good that you have to think about it before comparing fields declared against different domains since these comparisons don't often make sense.
Imagine, for example, the process of checking that a product code entered by a user is correct: "if the code exists in the x relation, or the y relation, or…". This is as ugly as the repeating group query in Chapter 2. Also, you might run into integrity problems with this structure if you have certain attributes that apply only to one product category (UnitsPerPackage, for example, which might pertain to Beverages but not DairyProducts) and the category of a particular product changes. What do you do in these circumstances?
Further Normalization The first three normal forms were included in Codd's original formulation of relational theory, and in the vast majority of cases they're all you'll need to worry about. " The further normal forms—Boyce/Codd, fourth, and fifth—have been developed to handle special cases, most of which are rare. Boyce/Codd Normal Form Boyce/Codd normal form, which is considered a variation of third normal form, handles the special case of relations with multiple candidate keys. In fact, for Boyce/Codd normal form to apply, the following conditions must hold true: • The relation must have two or more candidate keys.