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Database Concept and Design: Complex SQL Retrieval Queries

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Database Concept and Design: Complex SQL Retrieval Queries

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Questions and Answers

Which of the following operators is used with nested queries to compare a value with a set of values?

IN (correct)

NOT IN

EXISTS

What is the purpose of using nested queries in SQL retrieval?

To reduce the number of joins in a query

To apply a condition against an unknown value (correct)

To avoid using aggregate functions in a query

To simplify a query that retrieves data from a single table

What is the outer query in a nested query?

A query that uses aggregate functions to retrieve data

A subquery that is nested within another query

A query that contains a complete select-from-where block within its WHERE clause (correct)

A query that retrieves data from a subquery

What is the purpose of using aggregate functions in SQL retrieval?

To perform calculations on a set of values Signup and view all the answers

What is the result of a nested query that uses the IN operator?

A Boolean value (TRUE or FALSE) Signup and view all the answers

What is the primary function of the subquery in a nested query?

To return a temporary dataset for the outer query Signup and view all the answers

What is the purpose of the ANY or SOME operator in a nested query?

To return TRUE if a value is equal to some value in a set Signup and view all the answers

In a nested query, what happens when the subquery returns multiple tuples?

The outer query uses all the tuples returned by the subquery Signup and view all the answers

What is the purpose of the DISTINCT keyword in the example query?

To remove duplicates from the output Signup and view all the answers

What is the difference between the ANY and IN operators in a nested query?

There is no difference between the ANY and IN operators Signup and view all the answers