WIPRO SQL Interview Question - FIRST_VALUE( ) Function

One of the SQL questions recently asked in WIPRO interview.
We need to Find department wise minimum salary empname and maximum salary empname .
To solve this, we will write a query by using FIRST_VALUE() windows function for first approach and Rownumber() function for second approach.
Create table syntax
CREATE TABLE emps_tbl (emp_name VARCHAR(50), dept_id INT, salary INT);
INSERT INTO emps_tbl VALUES ('Siva', 1, 30000), ('Ravi', 2, 40000), ('Prasad', 1, 50000), ('Sai', 2, 20000), ('Anna', 2, 10000);
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