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Methods of organizing data
- 1. Methods of Organizing and Structuring Data
- 2. data is the vital ingredient or raw material that is processed in an information system. Structure of data can be examined from a technical or logical viewpoint. determining the structure of data involves identifying how the individual items of data must be arranged.
- 3. Records data which is used by business and government typically has the structure of a table. consider the problem of storing the following data about each student in your class: i. Name ii. age iii. birth date iv. address v. phone number
- 4. Table of data Identification Name Age Address Date of birth Phone Number Number A10-12586 Roxane 14 10 Black St 07/08/97 661-78-22 La’O Caulfield 3162
- 5. In the example given you could organize the data in a sorted order and distinguish each record by using ‘name’ field. Each field has two important attributes which must be carefully chosen. 1. each field must be given a set width 2. the type of each field must be determined
- 6. Fields Type Width Justification Name C (Characters) 20 Worse case lenght Address C 30 Fit all data Date of birth N (Numeric) 6 Can store 20.10.61 Phone C 12 Phone numbers as characters
- 7. Relational Data Structures Many organizational problems can be easily solved by storing data in more than one table or flat file.
- 8. Context Diagram Patrons Management System Book file Patron file Books Loan file
- 9. A relational database table or file needs to be designed in the same way as for a flat file. This means that we need to develop a data dictionary: Data dictionary-customers Field Name Data type Width Validation rule Customer ID Number > 0 and < 20 000 Customer name Character 30 Not blank Address Character 30 Suburb Character 20 Not blank Postcode Number >1000 and <10 000 Phone number character 15
- 10. Data structure-books Field name Data type Width Validation Rule Book ID Number >1 and <10 000 Title Character 60 Not blank Rental Currency >0 and <20 Rental period Number >0 and <50 Date loaned Date Customer ID Number >0 and <10 000
- 11. one patron can borrow many books; this is called one to many relationship. However, a single video can be relate to only one customer; this is referred to as a one to one relationship.
- 12. Relationships Books Customer Psychology Roxane English Algebra One to many relationship Book Customer Psychology One to one relationship
- 13. Design strategy for WWW documents When designing the basic data structure for a World Wide Web document you should: outline the overall block structure outline each sub-documentary structure outline each sub-secondary structure.
- 14. Data structure and design of a multimedia presentation HTML and Internet-enabled documents are examples of multimedia documents. Multimedia documents have the capacity to present information in a variety of formats: text, hypertext, sound, graphics and video.
- 15. Formats of Multimedia Presentation can be: Simple Multimedia Presentation In the past, such presentation would typically have been done with slides or an overhead projector. data structure of a standard presentation takes the format of a linear sequence of slides. the most common software used for this is powerpoint.
- 16. Complex Multimedia presentation: You will probably have seen many examples of World Wide Web documents. many of these contain the characteristics of a simple, linear multimedia design.
- 17. Important data structure design consideration 1. Structure of a Graphics File – a graphics file is a digitised version of an existing image or one that has been designed using graphic design doftware. size of the image location on screen resolution required colour required storage format display mode (for example: internet,word- processing,database).
- 18. 2. Testing and Validating Data Validation refers to the checking of data to ensure that it is reasonable. Testing of a solution refers to the process of verifying that a solution produces the correct results after data has been processed.
- 19. Validation: Input Name VALIDATE Date of Birth • Date of birth Age • Age Sex • Sex Write data to file on disk OK Record
- 20. Prepared by: Anna Roxane La’O