By Shashi Shekhar
Who Can take advantage of Spatial info administration? -- GIS and SDBMS -- 3 sessions of clients for Spatial Databases -- An instance of an SDBMS program -- A walk via Spatial Databases -- area Taxonomy and knowledge versions -- question Language -- question Processing -- dossier association and Indices -- question Optimization -- facts Mining -- Spatial innovations and information versions -- types of Spatial info -- Field-Based version -- Object-Based types -- Spatial facts varieties -- Operations on Spatial items -- Dynamic Spatial Operations -- Mapping Spatial gadgets into Java -- Three-Step Database layout -- The ER version -- The Relational version -- Mapping the ER version to the Relational version -- traits: Extending the ER version with Spatial options -- Extending the ER version with Pictograms -- tendencies: Object-Oriented information Modeling with UML -- comparability among ER and UML -- Spatial question Languages -- commonplace Database question Languages -- international Database -- RA -- The choose and venture Operations -- Set Operations -- subscribe to Operation -- simple SQL Primer -- DDL -- DML -- simple type of an SQL question -- instance Queries in SQL -- precis of RA and SQL -- Extending SQL for Spatial info -- The OGIS common for Extending SQL -- barriers of the traditional -- instance Queries that Emphasize Spatial elements -- tendencies: Object-Relational SQL -- a look at SQL3 -- Object-Relational Schema -- instance Queries -- Appendix: kingdom Park Database -- instance Queries in RA -- Spatial garage and Indexing -- garage: Disks and records -- Disk Geometry and Implications
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Extra resources for Spatial Databases: A Tour
If you specify a m a x i m u m number, what will happen when you need to store more than the m a x i m u m number of values? For example, what if you allow room for 10 dependents in the Employee entity just discussed and you encounter an employee with 11 dependents? Do you create another instance of the Employee entity to handle that person? Consider all the problems that doing so would create, particularly in terms of the unnecessary duplicated data. Note: Although it is theoretically possible to write a DBMS that will store an unlimited number of values in an attribute, the implementation would be difficult and searching much slower than if the maximum number of values were specified in the database design.
S t a t e distributor_zip d i s tr i bu for_phone d i s t r i bu tor__con t a c t _ p e r s o n con tac t _ p e r s o n _ e x t I tern 9i tem_numb title dis tribu tor_numb re tai l_,or ice re I ease_da te genre Figure 2-2: Major entities and their attributes for the Lasers Only database Domains Each attribute has a domain, an expression of the permissible values for that attribute. A domain can be very small. For example, a Tshirt store might have a Size attribute for its merchandise items with the values L, XL, and XXL comprising the entire domain.
As an example, assume that you are creating a database for a retail establishment that has more than one store. One of the things you are being asked to model in the database is an employee's schedule. Before you can do that, you need to answer the question of the relationship between an employee and a store: Is it one-to-many or many-to-many? Does an employee always work at only one s t o r e ~ 38 ENTITIES AND DATA RELATIONSHIPS Customer Actor *actor_numb D is tr ibutor ...........................................................