What are advanced aggregate functions in SQL?
An example of an AI chatbot conversation about advanced SQL aggregate functions.
What are advanced aggregate functions in SQL?
Advanced aggregate functions in SQL include functions like COUNT, SUM, AVG, MIN, MAX, and more complex ones like GROUP_CONCAT and JSON_AGG.
Can you explain how to use GROUP BY with these functions?
Sure! The GROUP BY clause groups rows that have the same values in specified columns into summary rows, like finding the total sales per region.
What is the difference between COUNT(*) and COUNT(column_name)?
COUNT(*) counts all rows, including duplicates and NULLs, while COUNT(column_name) counts only non-NULL values in that column.
Can you give me an example query using AVG and GROUP BY?
Absolutely! Here's an example: SELECT department, AVG(salary) FROM employees GROUP BY department; This calculates the average salary per department.
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