SQL Query Optimization

This quiz examines database structure rearrangement, unique row retrieval, and subqueries in SQL for query performance.

This fill in the blanks has 5 questions. Each question includes an explanation so you learn as you go.

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Question 1

The process of rearranging the structure of a database in order to improve query performance is called _______________.

Question 2

In SQL, the keyword used to retrieve a unique row from a table is _______________.

Question 3

A subquery enclosed in parentheses and located within the WHERE or HAVING clause of the outer query is called a _______________.

Question 4

The process of breaking down a complex query into multiple smaller and simpler queries to improve performance is known as query _______________.

Question 5

The SQL function used to retrieve the number of rows that match a specified condition is _______________.

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