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Chapter 7 Data Elements and Tables IT Key Ideas, Dynamic Database Systems, 2002 Databases page 75 Table A table or file is a collection of related data. For example, a book with pages listing the details of all the members in a club. Record A record, card or form, is a collection of data for one individual entity. Each record contains the same type of data. For example, the information about a single member is a record (one line of the membership page). Field A field is one element of data, one single attributes of the entity. For example, the member’s date of birth is a single element of data. IT Key Ideas, Dynamic Database Systems, 2002 Table Surname Burrell Bettridge Collins Harding Lucas Quintrell Robertson Rogers Washington Zengerer Given Name Patrick Shantala Joanna Barry Karina Holly May Romany Leandra Sibyl of members Address 7 Barker Rd 39 Heath Rd 16 Penworth Lane 35 Princeton Tce 30 Holldsworth St 39 Bellington St 8 Grote Rd 26 Young Rd 7 Sherriffs Rd 18 Junkett St IT Key Ideas, Dynamic Database Systems, 2002 Suburb Lurnea Ermington Elanora Ermington Elanora Lurnea Lurnea Ermington Elanora Elanora Phone 82762798 82124396 82938757 82947412 83844217 82637726 82683139 82689936 82705928 82700958 Title Mr Mrs Mrs Mrs Mrs Mrs Mrs Mrs Mrs Mrs Record LK Lucas a member Karina 30 Holldsworth St IT Key Ideas, Dynamic Database Systems, 2002 Elanora 83844217 Mrs Data Harding Lucas Quintrell a word, character Barry Karina Holly IT Key Ideas, Dynamic Database Systems, 2002 35 Princeton Tce 30 Holldsworth 39 Bellington St Database Management Systems A relational database management system consists of a number of tables. Each table stores data about a particular entity. The tables are related through common fields creating a system, from which data can be retrieved quickly and efficiently. Data Elements • a person’s surname • a person’s hair colour • a person’s date of birth • a car’s registration number • a teacher’s qualification • a student’s semester grade • a venue’s seat number • a venue’s seating capacity IT Key Ideas, Dynamic Database Systems, 2002 page 75 Calculated Data Elements page 75 • a student’s percentage (on a test) • a club’s number of financial members • a business’s profit • in a theatre the seats available IT Key Ideas, Dynamic Database Systems, 2002 Data Elements page 76 suggest at least six elements of data that would be stored IT Key Ideas, Dynamic Database Systems, 2002 Data Elements page 77 Exercise 7.1 IT Key Ideas, Dynamic Database Systems, 2002 Stored or Calculated Fields Data Element Lesson Date Lesson Time Instructor Swimmer Number of swimmers Date of Birth Group Number of lessons Fees paid Stored or Calculated? stored stored stored stored calculated stored stored calculated calculated IT Key Ideas, Dynamic Database Systems, 2002 Data Elements & Tables page 79 suggest at least six elements of data that would be stored in a Stores table Store Number Shop Number Address Suburb Phone Number Fax Number Manager IT Key Ideas, Dynamic Database Systems, 2002 Data Elements page 80 Exercise 7.3 IT Key Ideas, Dynamic Database Systems, 2002 Data Elements page 81 Exercise 7.4 IT Key Ideas, Dynamic Database Systems, 2002 Grouping Data Elements suggest at least ten fields and group them page 82 IT Key Ideas, Dynamic Database Systems, 2002 Registration Surname Registration # Date Paid Address Make Amount Paid Suburb Type Expiry Date Driver Licence # Engine # Renewal Period Driver Vehicle Renewal Grouping Data Elements page 83 Exercise 7.5 IT Key Ideas, Dynamic Database Systems, 2002 Chapter 7 ********************************