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This booklet brings the entire parts of database layout jointly in one quantity, saving the reader the time and rate of constructing a number of purchases. It consolidates either introductory and complicated issues, thereby masking the gamut of database layout method ? from ER and UML ideas, to conceptual facts modeling and desk transformation, to storing XML and querying relocating gadgets databases.
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Gates seatno flightno gateno 36 CHAPTER 2 Entity–Relationship Concepts flights flightno seats gateno ddate dtime seatno flightno Similarly the travels_on relationship is N-1, with Passengers on the “many” side, so by Transformation Rule 4 a foreign key, flightno, in the passengers table will connect each passengers row to the appropriate flights row. This column already exists in the passengers table, however, so the relational table design is complete. 5 NORMALIZATION: PRELIMINARIES Normalization is another approach to logical design of a relational database, which seems to share little with the ER model.
3 Additional ER Concepts 31 Orders entity. Attributes such as Line_items are known as external identifier attributes. When the Line_items weak entity is mapped to a relational table line_items, an ordno column is included by Transformation Rule 4 to represent the N-1 has_item relationship; thus, the primary key for the line_items table is constructed from the external attribute ordno and the weak entity identifier lineno. Note that it is also sometimes difficult to distinguish between a weak entity and a multivalued attribute.
5 NORMALIZATION: PRELIMINARIES Normalization is another approach to logical design of a relational database, which seems to share little with the ER model. However, it will turn out that a relational design based on normalization and a careful ER design transformed into relational form have nearly identical results, and in fact the two approaches reinforce each other. In the normalization approach, the designer starts with a real-world situation to be modeled and lists the data items that are candidates to become column names in relational tables, together with a list of rules about the relatedness of these data items.