AVG

AVG() is the mean — sum divided by count — computed only over the non-NULL values in that column.

Source data — Pattern 4: Aggregation

All queries run against the shared employees table (see schema.sql) — no new columns needed for this pattern.

AVG — source table 1

What it does

AVG() is the mean — sum divided by count — computed only over the non-NULL values in that column. Like SUM(), NULLs are excluded rather than counted as zero, which can quietly change the result if a column has gaps.

Problem

Find the average salary.

SELECT AVG(salary) AS average_salary
FROM employees;

Result

AVG — result 1