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Databases

Databases. All you wanted to know and more!. What is a database?. Used to store data Consists of Fields Records Files A field consists of Field Name Field Type Field Length. Advantages on a computerised database. Easy to amend data Fast searching & sorting Allows profile building……

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Databases

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  1. Databases All you wanted to know and more!

  2. What is a database? • Used to store data • Consists of • Fields • Records • Files • A field consists of • Field Name • Field Type • Field Length

  3. Advantages on a computerised database • Easy to amend data • Fast searching & sorting • Allows profile building…… • Retail Purchases • Criminals • Medical treatments

  4. Video Title Ctry Date Cln Star 1 A Few Good Men U.S. 1992 15 Tom Cruise 2 The Mask U.S. 1994 PG Jim Carrey 3 The Flintstones U.S. 1994 U John Goodman 4 Trainspotting U.K. 1996 18 Ewan McGregor 5 Crocodile Dundee AUS 1986 15 Paul Hogan 6 Elizabeth U.K. 1998 15 Cate Blanchett Flat File Databases • Sometimes called a traditional file database • All data held in one file • A spreadsheet can be used to hold a flat file database

  5. Problems with flat file databases • Redundant Data • Errors on input • Problems with updating data • Problems with modifying data

  6. Multiple Tables • Databases with multiple tables solve all these problems: • data independence • quality of management information • control over redundancy • consistency of data • more information available to users • greater security of data • less time spent inputting data

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