Podcast
Questions and Answers
What does the function COUNT(DISTINCT x) do?
What does the function COUNT(DISTINCT x) do?
Which of the following aggregation functions cannot be used in the WHERE clause?
Which of the following aggregation functions cannot be used in the WHERE clause?
If you want to find the minimum value of an attribute x, which function should you use?
If you want to find the minimum value of an attribute x, which function should you use?
What is the purpose of the DISTINCT keyword in aggregation functions?
What is the purpose of the DISTINCT keyword in aggregation functions?
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Which of the following correctly describes how aggregation functions operate?
Which of the following correctly describes how aggregation functions operate?
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Study Notes
Aggregation Functions
- Aggregation functions calculate a single value from multiple tuples for a specific attribute.
- Examples include calculating the sum of project budgets or finding the minimum value in an attribute.
- The
COUNTfunction counts tuples based on specified attributes.-
DISTINCToption eliminates duplicate counts.
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MIN(x),MAX(x),AVG(x), andSUM(x)find the minimum, maximum, average, and sum of values in attributex, respectively. - Aggregation functions operate on data within a
SELECTclause, never aWHEREclause.
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Description
This quiz covers the concept of aggregation functions in SQL, which are used to compute a single value from multiple tuples based on specified attributes. Participants will explore various functions like COUNT, MIN, MAX, AVG, and SUM, and understand their applications within SQL queries.
