By Eric Johnson
Powerful information modeling is key to making sure that your databases will practice good, scale good, and evolve to fulfill altering standards. besides the fact that, if you are modeling databases to run on Microsoft SQL Server 2008 or 2005, theoretical or platform-agnostic info modeling wisdom is not sufficient: types that do not replicate SQL Server's certain 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
This table also stored the possible answers the students could choose. 5, this table had problems. info 12 Chapter 1 Data Modeling Overview Let’s take a look at what makes this a bad design and how that affects data retrieval. The first four columns are OK; they store information about the question, such as the test where it appears and the question’s category. The problems start to become obvious in the next five columns. Columns a, b, c, and d store the text that is displayed to the user for the multiplechoice options.
Deciding what types of indexes to use and where to use them is a bit of a black art, but it is a critical part of your database. Index requirements are largely driven by business rules and usage information. What data does the business need to retrieve quickly? Will a given table typically be written to or read from? Answering these questions goes a long way toward determining your indexes. We look at indexes and explore considerations for implementing them in Chapter 10, Indexing Considerations.
Identifying versus Non-Identifying Relationships When the primary key of a child entity requires that the primary key of its parent entity be included, then the relationship between the entities is said to be identifying. This is because the child entity’s unique attribute relies on the parent entity’s unique attribute to correctly identify the corresponding instance. If this requirement is not in place, the relationship is defined as non-identifying. In an identifying relationship, the primary key from the parent entity is literally one of the attributes in the child entity’s primary key.