Database analysis & design with Microsoft Visio & Access

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Dr. Moore demonstrates the basics of database analysis and design using Microsoft Visio, as well as creating tables and relationships with Microsoft Access
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Question #2: You said a movie can only have one director. How do you handle those movies which start filming with one director then, for whatever reason, director #1 leaves and Director #2 finishes the movie?

pavulon
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I have a question regarding superkeys.

Superkeys must point to one and only one record, but is the inverse of that true? Does any one record point to one and only one superkey? In your YouTube video, you were discussing movies. You said the cover art is a superkey. What about movies which are released with multiple covers? Each of these covers represent one movie. Each of the covers would produce a new superkey but each of those keys would need to point to the same record.

pavulon
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Films often times have more than a single director these days.

factsoverfeelings