Write pl/sql To display employee name and employee department name for each employees? Write pl/sql block to: Create function to retrieve the salary of employees with given employee number? Write a pl/sql block to: . declare a variable N1 to be a numeric variable that has maximum of 4digits in body of program: Assign the value to N1. Display the value of N1. Increment Niby 4. Display the value of Ni along with the string: THE VALUE OF N1 INCREMENTED BY 4 IS