1. What are some of the difficulties in managing data?
- Firms have huge quantities of data so systems must be kept to hold the data for long periods of times
- The data must be organised into different sections for the sectors of the business
- To make better decisions the data needs to be external to the organisation; it needs to be secure and high quality.
2. What are the various sources for data?
Internal such as product information
Personal such as employee details etc
External sources out of organisation such as BOS
Internal such as product information
Personal such as employee details etc
External sources out of organisation such as BOS
3. What is a primary key and a secondary key?
Primary Key: is a key field that uniquely identifies an entity
http://www.eraserve.com/tutorials/images/MS_Access_Two_Primary_Keys.jpg
Secondary Key: another key field used to identify a specific record; indexing the data
Primary Key: is a key field that uniquely identifies an entity
http://www.eraserve.com/tutorials/images/MS_Access_Two_Primary_Keys.jpgSecondary Key: another key field used to identify a specific record; indexing the data
4. What is an entity and a relationship?
Entity: Person place and the thing – something we maintain information about within a database
Relationship: way entity’s relate to each other through tables using a common field one to one or one to many or many to many.
Entity: Person place and the thing – something we maintain information about within a database
Relationship: way entity’s relate to each other through tables using a common field one to one or one to many or many to many.
5. What are the advantages and disadvantages of relational databases?
Provides flexibility allowing complex queries and searches to gather knowledge about the entities.
But if design is too complex it is too slow to access
6. What is knowledge management?
Way to combine all the data sources in an organisation and bring them to a central screen. Many organisations have lots of different databases
Provides flexibility allowing complex queries and searches to gather knowledge about the entities.
But if design is too complex it is too slow to access
6. What is knowledge management?
Way to combine all the data sources in an organisation and bring them to a central screen. Many organisations have lots of different databases
7. What is the difference between tacit knowledge and explicit knowledge?
Explicit knowledge: objectionable, rational and technical types of knowledge: knowledge about each entity
Tacit knowledge: Using explicit knowledge to give incites and under the surface type knowledge
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