An office lighted with warm, incandescent lighting indicates a tendency toward:

A) formal communication.
B) gathering information from memos.
C) casual communication.
D) a person that is interested in external information.


C) casual communication.

Computer Science & Information Technology

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A structure __________ contain members of the same data type.

a. cannot b. can c. shouldn't d. None of these

Computer Science & Information Technology

The report ____ is used to identify the report so that you can open it in the future.

A. number B. name C. primary key D. database link

Computer Science & Information Technology

A(n) __________ page does not reside in physical memory because it has either been swapped out to disk or has not yet been loaded into memory.

a. valid b. active c. inactive d. invalid

Computer Science & Information Technology

Construct a relational algebra query that produces the same result as the outer join r  outer cond s using only these operators: union, di?erence, Cartesian product, projection, general join (not outer join). You can also use constant relations, that is, relations with ?xed content (e.g., one that has tuples ?lled with nulls or other prede?ned constants).

Let nullR be the relation over R that contains only one tuple, which entirely consists of NULLs. Similarly, let nulls be a relation over S that has a single NULL-tuple. Then r  outer conds is:

Computer Science & Information Technology