By Eric Johnson
Potent info modeling is key to making sure that your databases will practice good, scale good, and evolve to fulfill altering standards. besides the fact that, in case you are modeling databases to run on Microsoft SQL Server 2008 or 2005, theoretical or platform-agnostic info modeling wisdom isn't really sufficient: versions that do not mirror SQL Server's special real-world strengths and weaknesses frequently result in disastrous functionality.
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Extra info for A Developer's Guide to Data Modeling for SQL Server: Covering SQL Server 2005 and 2008
A variable-length field is defined as a field having no more than the number of characters specified in the length designation. To contrast char with varchar, specifying char(10) results in a field that contains ten characters, even if a specific instance of an entity has six characters in that specific attribute. The remaining four characters are padded. If the attribute is defined as a varchar(10), then there will be only six actual characters stored. The n prefix specifies that the data is being stored in a Unicode format.
This practice can cause a number of design problems later in development. For one thing, most data modeling software can generate a physical design based on the logical model, so choosing inappropriate data types in the logical model can lead to confusion in the physical design, particularly when multiple developers are involved. Be sure to refer frequently to the business requirements to ensure that you are defining attributes based on the data that will be stored. This practice will also help when you’re discussing the model with nontechnical stakeholders.
Any given vehicle probably has more than one type of seat, perhaps two bucket seats for the front passenger and driver and a single bench seat in the rear. However, automakers almost always reuse seats in multiple models of vehicles. So, as entities, Seats can be in multiple Vehicles, and Vehicles can have multiple Seats. Back to our university. What if the decision is made that a single dean can manage multiple schools or even that one school can have more than one dean? 5, we’ve arranged the Schools and Deans entities so that either entity can have multiple links to the other entity.
A Developer's Guide to Data Modeling for SQL Server: Covering SQL Server 2005 and 2008 by Eric Johnson