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Movie Language: MOVIE LANGUAGE ID CODE en 1 fr 1 en 2 fr 2 es 2 en 3 en 4 fr 4
Figure 1-5
First normal form solution
The Movie ID was copied from Movie (the original relation) to Movie Language (the new relation). The Lang. Code multivalued attribute was moved from the Movie relation to the Movie Language relation as the Language Code attribute. (The abbreviated attribute names in Figure 1-4 were for the purposes of illustration it is always best to abbreviate only when absolutely necessary.) The unique identi er of the Movie Language relation is the combination of Movie ID and Language Code, which amounts to all of the attributes in the relation. Neither Movie nor Movie Language in Figure 1-5 has repeating groups or multivalued attributes, so both relations are in rst normal form.
Relational Database Concepts
Second Normal Form: Eliminating Partial Dependencies
Before you explore second normal form, you must understand the concept of functional dependence. For this de nition, I ll use two arbitrary attributes, cleverly named A and B. Attribute B is functionally dependent on attribute A if at any moment in time there is no more than one value of attribute B associated with a given value of attribute A. Lest you wonder what planet the author lived on before this one, let s try to make the de nition more understandable. First, saying that attribute B is functionally dependent on attribute A also means that attribute A determines attribute B, or that A is a determinant (unique identi er) of attribute B. Second, let s have another look at relations in Figure 1-5. In the Movie relation, you can easily see that Movie Title is functionally dependent on Movie ID because at any point in time, there can be only one value of Movie Title for a given value of Movie ID. The very fact that the Movie ID uniquely de nes the Movie Title in the relation means that, in return, the Movie Title is functionally dependent on the Movie ID. A relation is said to be in second normal form if it meets the following criteria: The relation is in rst normal form. All non-key attributes are functionally dependent on the entire unique identi er (primary key). In applying the criteria to the Movie relation as shown in Figure 1-5, it should be clear that there are some problems. The entire unique identi er is the combination of Movie ID and Copy Number. However, only the Date Acquired, Date Sold, Media Format, and Retail Price attributes depend on the entire identi er. This does make logical sense. It doesn t matter how many copies of a particular movie you have they all have the same genre, MPAA rating, title, and production year. How did this happen It should be clear that some of the attributes describe the movie itself, while others describe copies of the movie that the video store has (or used to have) available. Essentially, I ve mixed attributes that describe two different (although related) real-world things (entities) in the same relation. No wonder it is such a mess. Second normal form will help us straighten it out. It should be clear by now that second normal form only applies to relations that have concatenated unique identi ers (that is, those made up of multiple attributes). In a relation with a single attribute as the unique identi er, it s impossible for anything to depend on part of the unique identi er because the unique identi er, being made of only one attribute, simply has no parts. It follows, then, that any rst normal form relation that has only a single attribute for its primary key is automatically in second normal form. Once you nd a second normal form violation, the solution is to move the attribute(s) that is (are) partially dependent to a new relation where it depends on
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