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Extra resources for Database Design: Know It All
Instead, if we assume that the entity F has max-card(F, R) = 1 and thus represents the “many” side of the relationship, the relational table T transformed from the entity F should include columns constituting the primary key for the table transformed from the entity E; this is known as a foreign key in T. Since max-card(F, R) = 1, each row of T is related by a foreign key value to at most one instance of the entity E. If F has mandatory participation in R, then it must be related to exactly one instance of E, and this means that the foreign key in T cannot take on null values.
6(a) has more than one incident connecting line, we record this fact using the notation max-card(E, R) = 1 and max-card(F, R) = 1. 6(b), assuming once again that this set of lines is representative of the designer’s intention, we can write min-card(E, R) = 0, since not every element of E is connected to a line, but min-card(F, R) = 1, since at least one line is connected to every element of F, and our assumption implies that this won’t change. We also write max-card(E, R) = N, where N means “more than one”; this means that the designer does not intend to limit to one the number of lines connected to each entity instance of E.
Hobbies eid hobby 197 chess 197 painting 197 science fiction 221 reading 303 bicycling 303 mysteries ... Definition: Relationship. Given an ordered list of m entities, E1, E2, . . , Em (where the same entity may occur more than once in the list), a relationship R defines a rule of correspondence between the instances of these entities. Specifically, R represents a set of m-tuples, a subset of the Cartesian product of entity instances E1 × E2 × . . × Em. 3 Relationships among Entities A particular occurrence of a relationship, corresponding to a tuple of entity occurrences (e1, e2, .