One of the most important steps in desiging a database is establishing the data model. Part one of a two-part article describes how to create a logical model.

However, within the logical data model the goal is to express the business rules and logic. Therefore, abstractions do not have to be avoided, but they should be used surgically. When an area of the ...

Logical models are based on functional dependencies between the data elements, and not number of reads. Once the discussion considers speed of response, or the number of reads, or the count of records ...