Pandas outer join
Intuition\n1. Merge two tables\n2. Select rows with at least one null\n\n\n# Code\n\nimport pandas as pd\n\ndef find_employees(employees: pd.DataFrame, salaries
# Intuition\n1. Merge two tables\n2. Select rows with at least one null\n\n\n# Code\n```\nimport pandas as pd\n\ndef find_employees(employees: pd.DataFrame, salaries: pd.DataFrame) -> pd.DataFrame:\n    df = pd.merge(employees, salaries, on=\'employee_id\', how=\'outer\')\n    return df[df.isna().any(axis=1)][[\'employee_id\']].sort_values(by=\'employee_id\')\n```
['Pandas']