Data Aggregation Techniques Quiz

Quiz covering Data Analysis

Questions in this quiz

A preview of the 5 questions covered. Start the quiz above to answer them, check your score, and read the explanations.

1. 1

   Which SQL function is primarily used to calculate the total sum of a specific numerical column across a group of rows?

2. 2

   When performing data aggregation in a relational database, which clause is required to group the result set by one or more columns?

3. 3

   You need to filter the results of an aggregation (e.g., show only departments with an average salary greater than $50,000). Which clause should you use?

4. 4

   Which of the following is true regarding the behavior of the COUNT() function in SQL?

5. 5

   If you perform a 'GROUP BY' on two columns, 'Region' and 'Product_Category', what is the resulting granularity of your aggregated data?