By Sikha Bagui
Info, Databases, and the software program Engineering ProcessDataBuilding a DatabaseWhat is the software program Engineering Process?Entity courting Diagrams and the software program Engineering lifestyles Cycle section 1: Get the necessities for the Database part 2: Specify the Database section three: layout the DatabaseData and knowledge ModelsFiles, documents, and knowledge ItemsMoving from three × five playing cards to ComputersDatabase Models The Hierarchical ModelThe community ModelThe Relational ModelThe Relational version and sensible DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional. Read more...
summary: info, Databases, and the software program Engineering ProcessDataBuilding a DatabaseWhat is the software program Engineering Process?Entity courting Diagrams and the software program Engineering lifestyles Cycle section 1: Get the necessities for the Database section 2: Specify the Database section three: layout the DatabaseData and information ModelsFiles, documents, and information ItemsMoving from three × five playing cards to ComputersDatabase types The Hierarchical ModelThe community ModelThe Relational ModelThe Relational version and sensible DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional
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Additional info for Database Design Using Entity-Relationship Diagrams, Second Edition
If a telephone number field were added, then the file format could be CUSTOMER (record_number, name, address, city, telephone) This shorthand format notation is referred to as the file design. ” On one hand, it is unique (which is desirable for a key), but on the other hand, you would have to know the record number to find a customer. The example is organized by record number; however, imagine 300 or more customers. You want to find Smith’s address— you would have to know the record number. It makes more sense to organize this file of 3 × 5 cards by name.
To give an example of a network approach, let us revisit the Person-Sports example but now allow a sports record to be connected to more than one person. Here is some sample data like those presented with more persons and more sports and using an MCP system in both directions: First, the data: Brenda: tennis, city courts; golf, municipal links Richard: golf, municipal links; snorkeling, Pensacola bay; running, UWF track Abbie: downhill skiing, Ski Beech David: snorkeling, Pensacola bay; golf, municipal links Kaitlyn: curling, Joe’s skating rink; downhill skiing, Ski Beech Chrissy: cheerleading, Mountain Breeze High; running, UWF track Now, suppose we diagram this conglomeration of data with pointers (we use record numbers in each “file”): PERSON(record_number, name, (sports)) SPORTS(record_number, sport, location, (who plays)) In each case, the part of the file description in parentheses that looks like (who plays) is called a repeating group, meaning that it can have multiple values.
The MCP system has some drawbacks regardless of which direction one approaches the relationship 26 • Database Design Using Entity-Relationship Diagrams (as MCP, FK, or both). For example, suppose you implemented the system with the child pointers in the parent record (MCP), and there were more child records than were planned. Suppose the system was not person and sports, but students at a school and absences. The student would be the parent, and the absence records would be the child. Now, suppose you designed this system with an MCP relationship so that a student could have up to 20 absences.