عندي سؤالين
Write a query that displays the difference between the highest and lowest salaries. Label the
column DIFFERENCE.
من جدول الموظفين
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Create a query that displays the employees’ last names and indicates the amounts of their
annual salaries with asterisks. Each asterisk signifies a thousand dollars. Sort the data in
descending order of salary. Label the column EMPLOYEES_AND_THEIR_SALARIES.


دى التمارين اللى موجود فى الماتريل بتاعت 9i

أخى الكريم هذه أجابة السؤال الثانى

SELECT rpad(last_name, 8)||' '|| 
   rpad(' ', salary/1000+1, '*')
		   EMPLOYEES_AND_THEIR_SALARIES
FROM  employees
ORDER BY salary DESC;

اسألك الدعاء لى و المسلمين

أخى الكريم هذه أجابة السؤال الثانى

SELECT rpad(last_name, 8)||' '|| 
   rpad(' ', salary/1000+1, '*')
		   EMPLOYEES_AND_THEIR_SALARIES
FROM  employees
ORDER BY salary DESC;

بالنسبه للسؤال الأول

SELECT   MAX(salary) - MIN(salary) DIFFERENCE
FROM	 employees;

اسألك الدعاء لى و المسلمين