By Teorey T.J., Lightstone S.S., Nadeau T., Jagadish H.V.
Database platforms and database layout expertise have gone through major evolution lately. The relational info version and relational database structures dominate enterprise functions; in flip, they're prolonged through different applied sciences like info warehousing, OLAP, and knowledge mining. How do you version and layout your database software in attention of latest know-how or new enterprise wishes? within the generally revised 5th variation, you will get transparent causes, plenty of fabulous examples and an illustrative case, and the fairly sensible recommendation you've come to count number on--with layout ideas which are acceptable to any SQL-based approach. yet you will additionally get lots that will help you develop from a brand new database clothier to an skilled clothier constructing industrial-sized structures. In-depth element and many real-world, sensible examples all through Loaded with layout ideas and illustrative case experiences which are acceptable to any SQL, UML, or XML-based procedure instantly necessary to someone tasked with the production of knowledge types for the mixing of large-scale company information. Read more... 1. creation 2. The Entity-Relationship version three. Unified Modeling Language (UML) four. specifications research and Conceptual Modeling five. reworking the Conceptual facts version to SQL 6. Normalization 7. An instance of Logical Database layout eight. item Relational layout nine. XML and net Databases 10. company Intelligence eleven. CASE instruments Appendix: the fundamentals of SQL
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Extra resources for Database modeling and design: logical design
9 Exclusion constraint. 31 32 Chapter 2 THE ENTITY–RELATIONSHIP MODEL External-project and Internal-project. At most, one of the associated entity instances could apply to an instance of Work-task. Foreign Keys and Referential Integrity A foreign key is an attribute of an entity or an equivalent SQL table, which may be either an identifier or a descriptor. A foreign key in one entity (or table) is taken from the same domain of values as the (primary) key in another (parent) table in order for the two tables to be connected to satisfy certain queries on the database.
Furthermore, two entities may have any number of binary relationships between them, and so on for any n entities (see n-ary relationships defined in the “General n-ary Relationships” section below). Connectivity of a Relationship The connectivity of a relationship describes a constraint on the connection of the associated entity occurrences in the relationship. ” For a relationship between entities Department and Employee, a connectivity of one for Department and many for Employee means that there is at most one entity occurrence of Department associated with many occurrences of Employee.
Notice that an activity diagram may 51 52 Chapter 3 THE UNIFIED MODELING LANGUAGE have multiple final states. However, there can only be one initial state. There are at least two uses for activity diagrams in the context of database design. Activity diagrams can specify the interactions of classes in a database schema. Class diagrams capture structure, and activity diagrams capture behavior. The two types of diagrams can present complementary aspects of the same system. 12 illustrates the usage of classes named Quote, Order, Invoice, and Payment.