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InterView Question 2
Imagine you have a PySpark DataFrame named df_employee with the following schema:

root
|-- employee_id: integer
|-- employee_name: string
|-- salary: double
|-- department: string
|-- hire_date: date
Your task is to perform the following operations:

1)Identify and count the number of null values in each column.
2)Replace null values in the salary column with the mean salary of all employees.
3)Replace null values in the department column with a default value of "Unknown."

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