Beginning Relational Data Modeling, Second Edition by Sharon Allen, Evan Terry

By Sharon Allen, Evan Terry

*Immediately obtainable to an individual who needs to layout a relational information model―regardless of past event

*Concise, undemanding reasons to a often complicated/ jargon-rich self-discipline

*Examples are in accordance with vast writer event modeling for genuine company structures

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Extra resources for Beginning Relational Data Modeling, Second Edition

Example text

Integrity: Are there business rule checks at the database level? ● Consistency and accuracy: Do the data values make sense? ● Enterprise appropriateness: Is this structure suitable for your company (are you trying to force a manufacturing application to manage contract documentation)? They may also participate in the quality assurance (QA) team by testing existing data sets or newly created processes for expected levels of integrity and quality. They frequently participate in testing data movement designs (extraction, transformation, and loading, or ETL) for source and target consistency.

Workarounds for this usually require creating duplicate records or tables to satisfy each different use of the same data, which can lead to data synchronization problems, since the same records appear in numerous places within the database. Another challenge with this type of design is the unnecessary duplication of records within a single record type and hierarchy. Look at the relationship of Student to Course. A student will often enroll for many courses, and the details of that student will be stored as a child of every course for which the student is enrolled.

Each column has a unique name within its owning table. By connecting records through matching data contained in database fields rather than the pointer constructs (unlike network databases), and by allowing for child records to have multiple parents (unlike hierarchical databases), this type of design builds upon the strengths of prior database systems. You’ll see in more detail how this is achieved in a moment, but let’s consider how the example would be represented in a relational database (see Figure 2-3).

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