By Jennifer Widom, Jeffery D. Ullman
Tremendous because of Leo over at MAM for this rip
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Additional info for A First Course in Database Systems (3rd Edition)
DROP followed by an attribute name. 4: Thus, for instance, we could modify the MovieStar relation by adding an attribute phone with: ALTER TABLE MovieStar ADD phone CHAR(16); As a result, the MovieStar schema now has five attributes: the four mentioned in Fig. 8 and the attribute phone, which is a fixed-length string of 16 byte In the actual relation, tuples would all have components for phone, but we know of no phone numbers to put there. Thus, the value of each of these components is set to the special null value, NULL.
It is nol usual to assume names of persons are unique and therefi suitable as a key. However, movie stars are different; one would never take a name thai some Other movie star had used. Tint we shall use the convenient fictlOD thai movie-star names are unique. A more conventional approach would he lo invent a serial number of some sort, like- social-security numbers. 50 that we could assign each individual a unique number and use that attribute as flukey. We take that approach for movie executives, as we shall see.
One purpose f these ID to make sure that in the company database each employee can be distinguished from all others, even if there are several employees with the same name. Tim the employee-ID attribute can serve as a key for a relation about emplov< In r s corporations, it is normal for every employee to have a Social-Securitj number. If the database has an attribute that is the Social-Securit\ number, then this attribute can also serve as a kev for employees. Note that th» is nothing wrong with tl '>*• in^ several choices of key, as there would be 6 employees ha\ , both employee IDs and Social-Security numbers.