11 Statement evaluation Specify whether each statement below

11. Statement evaluation. Specify whether each statement below is (i) always tne (ii) sometimes true, or (iii) never true. For those that are (ii) sometimes true, expli when the statement is true. a. A context diagram does not include data stores. b. A database table in 2NF is in 3NF as well. c. A salesperson is an external entity in a data flow diagram.

Solution

ii, sometimes true, some context diagrams will include data stores for customer data, or inventory data. ii, sometimes true, a 3NF table is, by definition, also in 1NF and 2NF. A 2NFtable maybe in 3NF, but not necessarily. ii, sometimes true, depending on the work the salesperson may be an external entity that directs the customer to purchase a certain product. A salesperson may be an external entity, depending upon how the system boundary is defined. ii, sometimes true, data flow diagrams give a more in depth information about the data itself, however flowcharts can give more info on the actual process, it reallydepends on the task at hand. ii, sometimes true, If the form is appropriately designed, it can be used to look up information in a table. i, always true. i, always true. i, always true. i, always true. iii, never true