A database model that describes the attributes of entities and the relationships among them. An entity is a file (table). Today, ER models are often created graphically, and software converts the ...
At its heart, data modeling is about understanding how data flows through a system. Just as a map can help us understand a city’s layout, data modeling can help us understand the complexities of a ...
If you've ever wondered what killed 4GLs the answer is a mistake - one that permeates almost everything in IT from about 1969 through to today. Codd's relational model wasn't designed as a solution to ...
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