Second Distinct Compensation Level

SQL practice question · Medium · Subqueries & CTEs · Facebook, Amazon, Google

staff has one row per employee (employee_id, salary). Return the second-highest DISTINCT salary. If there is no second distinct salary (for example all salaries are equal), return a single row containing NULL. Output a single column: second_highest_salary.

Table: staff

Schema of staff
Column	Type
employee_id	INTEGER
salary	INTEGER

Schema of staff

Column

Type

employee_id

INTEGER

salary

INTEGER

Sample rows of staff
employee_id	salary
1	100
2	200
3	200
4	150

Sample rows of staff

employee_id

salary

100

200

150

Expected output on the sample data
second_highest_salary
150

Expected output on the sample data

second_highest_salary

150

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