Questions and Answers
Which of the following is an example of a binary operation in relational algebra?
union
Which operation in relational algebra selects tuples that satisfy a given predicate?
select
What is the result of the Cartesian product operation in relational algebra?
A new relation with all possible combinations of tuples from the input relations
Which operation in relational algebra returns its argument relation with certain attributes left out?
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What is the result of a relational-algebra operation?
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What is the purpose of the select operation in relational algebra?
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What does the from clause in SQL do?
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Which operation allows us to combine information from any two relations?
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What is the result of the Cartesian product of the instructor and teaches tables?
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Which operation combines a select operation and a Cartesian-Product operation into a single operation?
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What does the union operation allow us to do?
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Which operator is used in relational algebra to give a name to the result of an expression?
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Which of the following queries is equivalent to the query 'Find information about courses taught by instructors in the Physics department with salary greater than $90,000'?
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What is the purpose of the rename operation in relational algebra?
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