Cap 233 info retrieval


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Cap 233 info retrieval

  1. 1. CAP 233 Organization ofInformation (Databases)
  2. 2. Attendance
  3. 3. What are we doing?Quiz 2!In-class group activity!Talk about database organization!If we have time well look at someof your mind maps
  4. 4. Quiz 2Go to Blackboard, Content link onleft side, Week 4 folder!Click on Quiz 2!When youre done turn off yourmonitor (not your computer) so I canknow when to continue with class.
  5. 5. Data & InformationWhat is data?!Data can be quantities (numbers),characters (text), symbols. (e.g. 080461)!What is information?!Information is data that is processed tohave meaning. (e.g. Birthday=080461)
  6. 6. What is a database?"A structured set of data held incomputer storage and typicallyaccessed or manipulated by meansof specialized software." (OED, 2012)!One could argue that format isirrelevant (electronic vs. printed)
  7. 7. In-class Group ActivityFollow the link for your group in theclass announcements in Blackboard!Discuss with your group & organizethe information!Share with the class why youorganized the way you did
  8. 8. Types of DatabasesFlat file!Hierarchical!Relational
  9. 9. Field RecordFlat File Database Example
  10. 10. What is a field?A field (aka attribute) is the smallestsubdivision of stored data in adatabase. In a table it is generallythe columns.
  11. 11. What is a record?A record (aka tuple) is a single setof related data held within adatabase. In a table it is generallythe rows.
  12. 12. Flat File Database: made up of "flatfiles" that usually contain one recordper line with no relationships betweenrecords.
  13. 13. Hierarchical Database
  14. 14. Hierarchical Database: ! database with tree structure allowing "parent/ child" relationships! one "parent" can have multiple "children" but not vice versa! e.g. a dog cannot be both a mammal and a fish
  15. 15. Relational Databases
  16. 16. Relational Databasemade up of multiple tablesrelated to each other!each record on a table hasa unique identifier (called a"key")
  17. 17. Advantages ofRelational DatabasesOvercomes the "parent/child" ofhaving only one "parent"!Prevents errors because one record isallowed to apply to any other table inthe database!allows access to database frommultiple access points
  18. 18. Relational dBase Example
  19. 19. Examples of DatabasesAmazon!Facebook (1 million Gb)!Academic Search Premier (Full textfor over 4,700 journals)
  20. 20. So, why should you care?Understanding how databases areorganized can help guide yoursearch strategy!Perhaps it will alleviate SOMEfrustration when searching
  21. 21. What you need to do this week...Go to Blackboard, Content link onleft side, Week 4 folder!Zotero (create acct, downloadprogram, watch video, accept emailinvite to CAP 233 group)!Start Phase 1 of your Final Project(Instructions will be forthcoming)