Context and question: The first task of a database designer is to produce a conceptual data model that reflects the structure of the information to be held in the database. A common approach to this is to develop an entity-relationship model, often with the aid of drawing tools. Another popular approach is the Unified Modeling Language. A successful data model will accurately reflect the possible state of the external world being modeled: for example, if people can have more than one phone number, it will allow this information to be captured. Designing a good conceptual data model requires a good understanding of the application domain; it typically involves asking deep questions about the things of interest to an organisation, like "can a customer also be a supplier?", or "if a product is sold with two different forms of packaging, are those the same product or different products?", or "if a plane flies from New York to Dubai via Frankfurt, is that one flight or two (or maybe even three)?". The answers to these questions establish definitions of the terminology used for entities (customers, products, flights, flight segments) and their relationships and attributes.
What must one have no knowledge of in order to create a successful data model?
Answer: unanswerable
Context and question: As of August 2015, Jehovah's Witnesses report an average of 8.2 million publishersthe term they use for members actively involved in preachingin 118,016 congregations. In 2015, these reports indicated over 1.93 billion hours spent in preaching and "Bible study" activity. Since the mid-1990s, the number of peak publishers has increased from 4.5 million to 8.2 million. In the same year, they conducted "Bible studies" with over 9.7 million individuals, including those conducted by Witness parents with their children. Jehovah's Witnesses estimate their current worldwide growth rate to be 1.5% per year.
Over how many hours had Jehovah's Witnesses spent preaching and in "Bible study" activity in 2015?
Answer: 1.93 billion
Context and question: Plymouth is home to Plymouth Argyle F.C., who play in the fourth tier of English football league known as Football League Two. The team's home ground is called Home Park and is located in Central Park. It links itself with the group of English non-conformists that left Plymouth for the New World in 1620: its nickname is "The Pilgrims". The city also has four Non-League football clubs; Plymouth Parkway F.C. who play at Bolitho Park, Elburton Villa F.C. who play at Haye Road, Vospers Oak Villa F.C. who play at Weston Mill and Plymstock United F.C. who play at Deans Cross. All four clubs play in the South West Peninsula League.
What is the home field of Plymouth Argyle F.C.?
Answer:
Home Park