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South China Agricultural University Computing Science 20052006 Database Systems Tutorial Set 4 (ANSWERS) Tutorial Questions (Functional Dependency and Normalization) 1. A relation NADIR is defined

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Hello and welcome in the last clip we talked about unary relationships a different kind of relationship where we were dealing with a single entity engaged in a relationship with its self and that's relatively common and quite useful in this clip we want to talk about a different departure from a binary relationship which is a degree higher than two instead of a green lower and that is called Turner a ternary relationship ternary meaning a degree of third, and so we have three entities participating in this relationship and ternary relationships are the least complicated specific example of an APRI while it gets complicated and very difficult to understand we can have relationships where four entities or five entities or six entities or however many entities we happen to have participating simultaneously although keeping track of exactly what's going on in relationships higher than three higher than ternary is a little tricky as a matter of fact turn our relationships can be a little tricky, but I think with a little time and effort you can get a grasp of what's going on with them, so I think the best thing to do is to go right into a concrete example so here's a concrete example, so we are a car manufacturer pick your favorite we'll say Ford doing relatively well from cells, and we have cars that we produce we could say vehicles, but we'll limit it to cars they have parts that go into their manufacturer and let's limit our consideration to the parts that we do not manufacture ourselves car manufactures buy a lot of their components okay, so we've got cars that are built from parts we've got parts coming from supplier, although really I just violated one of my rules which is keep all of your entity names singular because singular entity names keep assigning cardinalities a little more straightforward okay, so the thing with the ternary relationship is there are three entities participating simultaneously in a relationship with one another so because of that fact when we're considering cardinality we need to consider it within the context of two parts simultaneously relative to the third so let's take a look at what that might mean so let's say for give an instance of a supplier and a given instance of a part can that supplier supply that part for at most one car or can they supply it for multiple cars so say for example we've got a steering wheel I don't have what is the steering wheel look like that that's the worst drawing of steering wheel I've ever seen pretend that didn't happen imagine in your mind a steering wheel we've got a steering wheel it's supplied to us by multiple suppliers we've got you know steering wheel part st one is supplied to us by acme the steering wheel company steer co and other companies but what we need to do is consider the given part supplied by a given supplier is there ever an instance where that suppliers steering wheel or any other part goes into multiple cars if so than the cardinality for car is going to be...

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