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This is true of simple tables such as a list of names and phone numbers or tables of scientific data with one key attribute and one or more simple descriptive attributes such as the example of chromosome data from UW-FHCRC (http://pga.gs.washington.edu).
The main problem with flat file databases is that they don't handle redundancy very well. If one or more of the entities in the database have the same value for an attribute, and that value is a complex value like "publisher information" or "course information", then the complex value must be repeated for each entity in the database. When the same information is repeated, it is very likely that it will contain small (or large) differences each time it is entered, and so the database will be inconsistent...
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