Handbook of Relational Database Design

by Candace C. Fleming

rating: 4.0 (19 reviews)

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Details:
Amazon rank: #1,265,944
Price: $36.83
bound: 624 pages
Publisher: Addison-Wesley Professional; 1 edition (January 11, 1989)
Language: English

ISBN-10: 0201114348
ISBN-13: 978-0201114348
Weight: 1.4 pounds

You'll usually do this for performance reasons or because the users of the database demand itCreate prototype queries, forms, and reportsBusiness rules are an important part of database integrityThe tblOrder4 table is in First Normal FormWhen normalizing, you don't throw away informationThus, the tblPatient table in a medical database would be related to the tblInsurer table in a many-to-many relationshipDatabase design is an important component of application designThe repeating groups of information violate First Normal Form

You could now easily construct a query to calculate the number of hammers orderedIn order to improve report performance, you decide to create a column named TotalOrderCost that contains a sum of the cost of each order item in tblOrderDomains can be thought of as user-defined column types whose definition implies certain rules that the columns must follow and certain operations that you can perform on those columnsYou'd have a difficult time retrieving information from this table, because too much information is being stored in the Items fieldYou can also include skills content, your own material and brand it to your course and your institution.Read about Durham University's experience of creating a bespoke course eBook for their engineering students catalogue.pearsoned.co.uk/assets/hip/gb/uploads/casestudies/DurhamUniversityeBooksCaseStudy.pdfPersonalised Digital SolutionsPearson Learning Solutions will partner with you to create a completely bespoke technology solution to your course's specific requirements and needsOn the other hand, Microsoft Access will not prevent you from joining the Integer column EmployeeAge from one table to the Integer column YearsWorked from a second table, even though these two columns are obviously from different domainsThe basic idea behind the relational model is that a database consists of a series of unordered tables (or relations) that can be manipulated using non-procedural operations that return tablesMicrosoft Access 2.0 also supports the specification of a global rule that applies to the entire tableKeys can be simple or compositeThe Normal Forms are based on relations rather than tables

Draw relationships between the tables, noting if they are one-to-one or one-to-manyThe tblOrderDetail table from Figure 11, for example, is in 2NF because all of its non-key columns (Quantity, ProductId and ProductDescription) are fully dependent on the primary keyYou can even integrate your own material if you wishYou will be informed within 7 days if your order is not approved.View BookBagYou have selected a title that is subject to further approvalSpecifying a relationship with referential integrity between the tblCustomer and tblOrder tables using the EditRelationships commandEvery higher normal form is a superset of all lower formsWhenever a record in tblOrderDetail is inserted, updated, or deleted, you will need to update tblOrder, or the information stored there will be erroneous c6927ae614

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September 2018