An error that occurs while an application is running is called a(n) ____.
A. bug
B. runtime upset
C. exception
D. inception
Answer: C
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Answer the following questions with reference to how the ER model in Figure 17.13 maps to relational tables.
The ER diagram in Figure 17.13 shows only entities and primary key attributes. The absence of recognisable named entities or relationships is to emphasize the rule-based nature of the mapping rules described in Step 2.1 of logical database design.
(a) How many relations will represent the ER model?
(b) How many foreign primary keys are mapped to the relation representing X?
(c) Which relation(s) will have no foreign key?
(d) Using only the letter identifier for each entity, provide appropriate names for the relations mapped from the ER model.
(e) If the cardinality for each relationship is changed to one-to-one with total participation for all entities; how many relations would be derived from this version of the ER model?
The date shown in the Current Date field produced by the DATE function of a query is:
A) the date on which the query was last altered. B) the date on which the query was last saved. C) the date on which the query was first created. D) the date on which the query is run.
What special accommodation do some designers make for mobile devices?
What will be an ideal response?
A mobile device with a touchscreen uses which of the following as an overlay on the display?
a. Randomizer b. Digitizer c. Wi-Fi antenna d. Webcam