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Introduction to SQL
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Question
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.
Correct Answer
all columns of the table are to be returned.
More questions
1. Which of the following is true concerning open-source DBMS?
Options
A. Is free or nearly free database software whose source code is publicly available
B. Is free or nearly free database software whose source code is not publicly available
C. Is not competitive against PC-oriented packages and is fully SQL compliant
D. Is competitive against PC-oriented packages and is not fully SQL compliant
Show Answer
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Correct Answer: Is free or nearly free database software whose source code is publicly available
2. Views constructed from SQL SELECT statements that conform to the SQL-92 standard may not contain:
Options
A. GROUP BY.
B. WHERE.
C. ORDER BY.
D. FROM.
Show Answer
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Discuss
Correct Answer: ORDER BY.
3. A server cannot serve on which of the following levels?
Options
A. Client Layer
B. Business Layer
C. Database Layer
D. All of the above.
Show Answer
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Correct Answer: Client Layer
4. When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?
Options
A. Disjoint with total specialization
B. Disjoint with partial specialization
C. Overlap with total specialization
D. Overlap with partial specialization
Show Answer
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Correct Answer: Overlap with total specialization
5. Which of the following occurs when one transaction reads a changed record that has not been committed to the database?
Options
A. Nonrepeatable read
B. Phantom read
C. Dirty read
D. Consistent read
Show Answer
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Correct Answer: Dirty read
6. The wildcard in a WHERE clause is useful when?
Options
A. An exact match is necessary in a SELECT statement.
B. An exact match is not possible in a SELECT statement.
C. An exact match is necessary in a CREATE statement.
D. An exact match is not possible in a CREATE statement.
Show Answer
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Correct Answer: An exact match is not possible in a SELECT statement.
7. Each answer below shows example data from a table. Which answer is an example of the general-purpose remarks column problem?
Options
A. Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
B. Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
C. Three rows have the values Brown, NULL, and Blue in the same column.
D. One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.
Show Answer
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Correct Answer: One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.
8. Entities can be associated with one another in which of the following?
Options
A. Entities
B. Attributes
C. Identifiers
D. Relationships
Show Answer
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Correct Answer: Relationships
9. The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
10. An action assertion is a statement that expresses some aspect of the static structure of the organization.
Options
A. True
B. False
Show Answer
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Correct Answer: False
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