Object-Oriented Database Systems in Visual Basic .NET

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121 Object-Oriented Database Systems
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Book Title Inductive Logic dBASE III: Ready Reference Manual
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Author Table Figure 123
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Title (Book) Table
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Link Table (Author Title) A table set showing a many-to-many relationship
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Tables and relationships are the de ning components of a relational database, and every database system bene ts from the meticulous design of these By carefully considering the entities that appear in tables (rows), and the primary as foreign key elds required to relate them appropriately, a developer can create a foundation that will support a complex data management system through many different versions of the operating software
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Exercise 122
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Devise a table structure for dealing with bank accounts and transactions, using the descriptions given in 10 You will need select or provide a primary key eld and a foreign key eld for creating the link between the tables
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12117 Normalization
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Given a well-organized table structure with key elds to de ne relationships between records as discussed in the previous section, we can quite easily build up a database system It should be obvious that a certain amount of optimization can be performed on a set of data to minimize the amount of space used and to improve its logical structure (and thereby simplify any changes that may need to be imposed on it in the future) Working from a set of entity descriptions, and carefully checking to ensure that there are no hidden relationships between values in elds (attributes) can result in a well-organized structure Many database designers and programmers work out a table structure for a database almost intuitively, and manage to produce totally logical and maintainable structures in this way However, it is dif cult to teach this approach to database design since generally it is based on experience gained over a long period in database development This usually includes much experience gained by doing it wrong and having to apply a lot of effort to recover from a structural disaster (possibly the most effective form of experience) It also depends on the designer being able to work from the ground up, allocating descriptions for the items that will appear in the database and assigning elds to tables as necessary Often, data already exists and a suitable structure must be created to t it There is a more realistic approach to database design which, with a little effort, will generally lead to an optimal data structure The process is known as normalization, and involves organising existing data into optimal table structures by grouping
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12 n Databases in Visual Basic NET
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attributes to form entities of an ef cient size and composition The eventual goal of this is to eliminate the storage of duplicated information and to create the best structure for accommodating future changes to the data A full description of normalization is beyond the scope of this book Almost any decent book on database design (eg Database Systems, A Practical Approach to Design, Implementation and Management, by Connolly and Begg) will describe the technique more than adequately
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1212 SQL: An Implementation of Relational Calculus
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There are many DBMS systems in operation in the world, and many of these use proprietary languages for creating databases, populating them with data, and extracting speci c sets of information from them Most use the notion of sets of data explicitly, and these languages are therefore characterized as set-oriented Of all of the available languages for RDBMS operation, Structured Query Language (SQL), originally de ned by IBM in the 1970s is regarded as a standard; the lingua franca for relational database management SQL was developed from Sequel, IBM s rst attempt at a RDBMS language There are two distinct parts to SQL, both of which are necessary to form a language that obeys Codd s rule 5, which relates to the facilities necessary for a RDBMS These parts are a Data De nition Language (DDL), which allows the structure of databases to be de ned and altered, and a Data Manipulation Language (DML), which allows data to be entered into a database, altered and extracted from it Using the two components of SQL, a database developer can construct SQL statements to manipulate the structure or content of a database SQL can be used to perform three types of operation: 1 queries can return views of a database (DML); 2 SQL updates can update a database contents (DML); 3 other SQL statements can modify the structure of a database (DDL) Of these, the query is the type of SQL statement that is used most often SQL has been implemented in one form or another by just about every software company that has claims to producing DBMS systems Some products have only a DML component while others incorporate both components Some with a DML component only usually make use of some form of Graphics User Interface (GUI)-based data de nition tool for de ning and altering tables Few of the available implementations of SQL are fully compatible with the standard language (A de nitive version was published in 1992 by two related authorities; a 580 page speci cation published by ANSI as American National Standard X3135-1992 and one by ISO/IEC as International Standard 9075:1992 The two speci cations are word-for-word identical) A command-line environment (Oracle, Ingres) fronts some SQL implementations These usually include optional GUI tools Others are implemented as embedded languages, which are hosted by other
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