Write a query to find the second highest value in a specific column.
Use employee_compensation.annual_salary as the target column and treat duplicate salary values as one distinct value. Return NULL if fewer than two distinct non-NULL salary values exist.
second_highest_salary.annual_salary.| Column | Type | Description |
|---|---|---|
| employee_idPK | INT | Unique employee identifier |
| employee_name | VARCHAR(100) | Employee name |
| annual_salary | DECIMAL(12,2) | Annual salary amount |