Question: Exercise 3 (1%) Write PL/SQL block that will display the highest and lowest employee salary In department_Id 60. Exercise 4 (1%) Write PL/SQL block that

Exercise 3 (1%) Write PL/SQL block that will display the highest and lowest employee salary In department_Id 60. Exercise 4 (1%) Write PL/SQL block that will display the average salary in department_Id 50
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