How should I practice Second Highest Salary?

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Second Highest Salary

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Problem statement

The table employees contains salary values. Find the second-highest distinct, non-NULL salary.

Equal salaries share one rank. Ignore rows whose salary is NULL.

Return exactly one row and one column named second_highest_salary. If fewer than two distinct non-NULL salaries exist, that row must contain NULL.

Table schema

MySQLPostgreSQLPandas

Use the same input data with any supported language. Open the Schema tab in the editor to see the generated SQL setup or Pandas DataFrames.

employees

Only the salary column is needed for this query.

Column	Type	Nullable	Description
salary	Integer	Yes	Employee salary; NULL denotes an unknown salary.

Expected result

Your query or function must return these columns.

Column	Type	Nullable	Description
second_highest_salary	Integer	Yes	Second-highest distinct known salary, or NULL when absent.

Row order: must match exactly. Numeric tolerance: 0.

Constraints

employees contains between 0 and 2000 rows.
Each known salary is an integer from 0 through 10^9, inclusive.
The table may contain duplicate salary values and NULL salaries.