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Basic_Concepts_Databases

Basic_Concepts_Databases - Database Concepts Drs Antonio A...

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Virginia Tech (copyright A.A. Trani) Database Concepts Drs. Antonio A. Trani and D. Gallagher Dept. of Civil and Environmental Engineering
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Virginia Tech (copyright A.A. Trani) Why Learn Databases? Engineers need to manipulate large amounts of data Data sometimes comes in a variety of formats Data is both numeric and character or “string” data Databases simplify the handling of various data sets Organizes information Can create simple interfaces to enter and retrieve data 2
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Virginia Tech (copyright A.A. Trani) Database Management Systems Combination of computer hardware and software designed to (collect), organize, store, manipulate, and analyze data Database is collection of persistent data Purpose of database is to store info about certain types of objects termed entities or objects The Web is full of good examples of databases Bureau of Transportation Statistics (BTS) http://www.transtats.bts.gov / National Geologic Map Databases (USGS) http://ngmdb.usgs.gov/Other_Resources/ rdb_es.html 3
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Virginia Tech (copyright A.A. Trani) Bureau of Transportation Statistics (BTS) http://www.transtats.bts.gov / 4
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Virginia Tech (copyright A.A. Trani) National Geologic Map Databases (USGS) http://ngmdb.usgs.gov/Other_Resources/ rdb_es.html 5
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Virginia Tech (copyright A.A. Trani) USEPA Water Quality Monitoring Data http://www.epa.gov/storet/dbtop.html 6
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Virginia Tech (copyright A.A. Trani) Database Entities Entity object about which database is designed to store information for example, a water quality monitoring database, entities might include stations, pollutants, samples, analytical methods. Entity class or class entire collection of all possible entities of a specific type that database might contain. An abstract description of an object Entity set collection of specific entities that the database currently contains 56a
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Virginia Tech (copyright A.A. Trani) Database Entity Attributes Properties of entities in entity class Attributes usually stored as fields(columns) in table Attributes used to uniquely identify individual entities within an entity class Example: attributes of station may include station ID, River mile (location), date established, date removed, owner... Attributes also used to describe relationships to entities in other entity classes 8
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Virginia Tech (copyright A.A. Trani) Relational Database Programs Oracle (http://www.oracle.com/us/index.html ) Microsoft Access (http://office.microsoft.com/en-gb/ access/) Filemaker (http://www.filemaker.com /) MySQL (http://www.mysql.com /) Microsoft SQL Azure (http://www.microsoft.com/en- us/sqlazure/database.aspx ) 9
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Virginia Tech (copyright A.A. Trani) Sample Airport Database Created in Filemaker Pro using publicly available data from the Federal Aviation Administration 10
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Virginia Tech (copyright A.A. Trani) Relationships in Airport Database 11
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Virginia Tech (copyright A.A. Trani) Entities in the Airport Database 12 The database contains various datasets such as: Airports Runways
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