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Questions and Answers
What kind of join is applicable if any other comparison operator is used?
What kind of join is applicable if any other comparison operator is used?
- Equijoin
- Theta join (correct)
- Natural join
- Implicit join
Which relational operator yields only the rows that appear in both tables?
Which relational operator yields only the rows that appear in both tables?
- Difference
- Equijoin
- Intersect (correct)
- Union
What is an attribute that uniquely identifies any given entity?
What is an attribute that uniquely identifies any given entity?
- Super key
- Secondary key
- Primary key (correct)
- Composite key
What command marks and saves the current point in the processing of a transaction?
What command marks and saves the current point in the processing of a transaction?
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Which term best describes the collection of interrelated data?
Which term best describes the collection of interrelated data?
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What yields all rows in one table not found in the other table?
What yields all rows in one table not found in the other table?
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What type of database supports data located at a single site?
What type of database supports data located at a single site?
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What does DML stand for in the context of database management systems?
What does DML stand for in the context of database management systems?
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Which of the following is NOT a type of database anomaly?
Which of the following is NOT a type of database anomaly?
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Which attribute can have many values?
Which attribute can have many values?
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What is a candidate key?
What is a candidate key?
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What type of database supports only one user at a time?
What type of database supports only one user at a time?
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