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Question
A regular subquery can be processed:
Options
A. from the top down.
B. from the bottom up.
C. by nesting.
D. None of the above is correct.
Correct Answer
from the bottom up.
More questions
1. Apache Web server does not support servlets.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
2. A unique, DBMS-supplied identifier used as the primary key of a relation is called a(n):
Options
A. primary key.
B. foreign key.
C. composite key.
D. surrogate key.
Show Answer
Scratch Pad
Discuss
Correct Answer: surrogate key.
3. If attribute A determines both attributes B and C, then it is also true that:
Options
A. A ? B.
B. B ? A.
C. C ? A.
D. (B,C) ? A.
Show Answer
Scratch Pad
Discuss
Correct Answer: A ? B.
4. Two basic constructs to link one piece of data with another piece of data: sequential storage and pointers.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
5. In an SQL SELECT statement querying a single table, according to the SQL-92 standard the asterisk (*) means that:
Options
A. all columns of the table are to be returned.
B. all records meeting the full criteria are to be returned.
C. all records with even partial criteria met are to be returned.
D. None of the above is correct.
Show Answer
Scratch Pad
Discuss
Correct Answer: all columns of the table are to be returned.
6. An attribute's value is either a literal or an object identifier.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
7. Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
8. SUM, AVG, MIN, and MAX can only be used with numeric columns.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
9. In a 1:N relationship, the foreign key is placed in:
Options
A. either table without specifying parent and child tables.
B. the parent table.
C. the child table.
D. either the parent table or the child table.
Show Answer
Scratch Pad
Discuss
Correct Answer: the child table.
10. SQL is a programming language.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
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