SQL Exercise: List the employees along with grades in ascending order

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83. From the following tables, write a SQL query to find the employees along with grades in ascending order. Return complete information about the employees.

Pictorial Presentation:

Sample table: employees

Sample table: salary_grade

Sample Solution:

SELECT *
FROM employees e,
     salary_grade s
WHERE e.salary BETWEEN s.min_sal AND s.max_sal
ORDER BY grade ASC;

OR

SELECT *
FROM employees e,
     salary_grade s
WHERE e.salary >= s.min_sal
  AND e.salary <= s.max_sal
ORDER BY s.grade ASC;

Sample Output:

 emp_id | emp_name | job_name  | manager_id | hire_date  | salary  | commission | dep_id | grade | min_sal | max_sal
--------+----------+-----------+------------+------------+---------+------------+--------+-------+---------+---------
  63679 | SANDRINE | CLERK     |      69062 | 1990-12-18 |  900.00 |            |   2001 |     1 |     800 |    1300
  68736 | ADNRES   | CLERK     |      67858 | 1997-05-23 | 1200.00 |            |   2001 |     1 |     800 |    1300
  69000 | JULIUS   | CLERK     |      66928 | 1991-12-03 | 1050.00 |            |   3001 |     1 |     800 |    1300
  65271 | WADE     | SALESMAN  |      66928 | 1991-02-22 | 1350.00 |     600.00 |   3001 |     2 |    1301 |    1500
  66564 | MADDEN   | SALESMAN  |      66928 | 1991-09-28 | 1350.00 |    1500.00 |   3001 |     2 |    1301 |    1500
  69324 | MARKER   | CLERK     |      67832 | 1992-01-23 | 1400.00 |            |   1001 |     2 |    1301 |    1500
  64989 | ADELYN   | SALESMAN  |      66928 | 1991-02-20 | 1700.00 |     400.00 |   3001 |     3 |    1501 |    2100
  68454 | TUCKER   | SALESMAN  |      66928 | 1991-09-08 | 1600.00 |       0.00 |   3001 |     3 |    1501 |    2100
  66928 | BLAZE    | MANAGER   |      68319 | 1991-05-01 | 2750.00 |            |   3001 |     4 |    2101 |    3100
  67832 | CLARE    | MANAGER   |      68319 | 1991-06-09 | 2550.00 |            |   1001 |     4 |    2101 |    3100
  65646 | JONAS    | MANAGER   |      68319 | 1991-04-02 | 2957.00 |            |   2001 |     4 |    2101 |    3100
  67858 | SCARLET  | ANALYST   |      65646 | 1997-04-19 | 3100.00 |            |   2001 |     4 |    2101 |    3100
  69062 | FRANK    | ANALYST   |      65646 | 1991-12-03 | 3100.00 |            |   2001 |     4 |    2101 |    3100
  68319 | KAYLING  | PRESIDENT |            | 1991-11-18 | 6000.00 |            |   1001 |     5 |    3101 |    9999
(14 rows)

Explanation:

The said query in SQL that selects all columns from the tables 'employees' and 'salary_grade' where the employee's salary falls within the minimum and maximum salary range of a certain grade. The results are ordered by grade in ascending order.

The implicit join between 'employees' and 'salary_grade' table where the employee's salary must be between the minimum and maximum salary of the grade.

Relational Algebra Expression:

Relational Algebra Tree:

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Sample Database: employee

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Previous SQL Exercise: Employees under a given department ORDER BY dep_id ASC.
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