Master SQL for Data Analysis - As Inline Views (FROM)

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Information Technology (IT), Architecture
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University
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is an inline view in SQL?
A type of join operation
A method to update multiple tables simultaneously
A subquery used in the WHERE clause
A virtual table created by a subquery in the FROM clause
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it necessary to provide an alias for a subquery used as an inline view?
To improve query performance
To distinguish it from other tables in the query
To avoid syntax errors
To ensure the subquery is executed first
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In what order are subqueries in the FROM section executed?
Only if the main query fails
Simultaneously with the main query
Before the main query
After the main query
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in calculating the maximum average book rating using an inline view?
Select the maximum rating directly from the ratings table
Group the ratings by ISBN and calculate the average rating for each book
Create a temporary table with all book ratings
Filter the ratings to include only those above a certain threshold
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can inline views help in managing complex queries?
By eliminating the need for joins
By automatically optimizing the query execution
By breaking down the query into smaller, more manageable parts
By reducing the number of tables needed
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