Here is the basic syntax of the ORDER BY clause:
Syntax
SELECT select_list
    FROM table_expression
    ORDER BY sort_expression1 [ ASC | DESC ] [ NULLS { FIRST | LAST } ]
             [, sort_expression2 [ ASC | DESC ] [ NULLS { FIRST | LAST } ] ...]

​
Examples

Let’s assume we have a table named “employees” with columns “employee_id”, “employee_name”, and “salary”.
employees
employee_id | employee_name | salary
-------------+---------------+--------
           2 | Bob           |  60000
           4 | David         |  55000
           1 | Alice         |  50000
           3 | Charlie       |  70000
           5 | Eve           |  75000
Code of creating the table and inserting data 
CREATE TABLE employees (
    employee_id INT,
    employee_name VARCHAR,
    salary INT
);

INSERT INTO employees (employee_id, employee_name, salary) VALUES
(1, 'Alice', 50000),
(2, 'Bob', 60000),
(3, 'Charlie', 70000),
(4, 'David', 55000),
(5, 'Eve', 75000);
To retrieve the list of employees sorted by their salaries in descending order, the SQL query would be: 
SELECT employee_id, employee_name, salary
FROM employees
ORDER BY salary DESC;

----RESULT
employee_id | employee_name | salary
-------------+---------------+--------
           5 | Eve           |  75000
           3 | Charlie       |  70000
           2 | Bob           |  60000
           4 | David         |  55000
           1 | Alice         |  50000
(5 rows)
In this example, the result set displayed the employees’ details sorted by their salaries in descending order, showing the highest-paid employees first. The ORDER BY clause helps in arranging data in a structured and meaningful way for easier interpretation and decision-making.