Order By Clause in MySQL




Hello and welcome everyone. In this article, we will learn about the Order By Clause in MySQL. Let’s go.

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MySQL Order by clause is used to sort the records or data in ascending or descending order. Order by clause allows us to sort records or data by a single column or multiple columns in ascending or descending order. There are two key using in Order by clause:
         ASC: - sorting data or records by ascending order.
         DESC: - sorting data or records by descending order.
Syntax:
         SELECT column_name_1, column_name_2, …
         FROM table_name
         WHERE condition
ORDER BY column_name_1 [ ASC | DESC ], column_name_2 [ ASC | DESC ]
Here is,
          SELECT this statement using retrieve data from database table in ascending or descending order.
          WHERE condition is the optional used to condition on the query.
          ORDER BY clause is performing sorting the records or data.
          [ ASC | DESC ] this keyword used to sort data or records in ascending or descending order.

Note: - ASC or ascending order is used as a default on the SELECT statement.



For example
Here is the, we will create a table for an employee in the database.

CREATE TABLE IF NOT EXISTS employee (
                   e_id int (10) PRIMARY KEY,
                   e_firstname varchar (50) NOT NULL,
                   e_lastname varchar (50) NOT NULL,
                   e_age int (10),
                   e_city varchar (250)
e_sex char (1)
e_phnumber int (15) NOT NULL
)

Here we insert record in the employee table.
INSERT INTO employee (
  ‘e_id’, ’e_firstname’, ’e_lastname’,
  ’e_age’, ’e_city’, ’e_sex’,
  ’e_phnumber’
)
VALUES
  (
    1, ‘Hone’, ‘Reus’, 26, ‘San Jose’, ‘M’, ‘ + 1 555 555 1111’
  ),
  (
    2, ‘Cries’, ’Fence’, 23, ’Fresno’, ’F’, ’ +1 555 555 1111’
  );

Final Result
‘e_id’ ’e_firstname’ ’e_lastname’ ’e_age’ ’e_city’  ’e_sex’ ’e_phnumber’
  1         Hone              Reus              26      San Jose    M       +1 555 555 1111
  2         Cries              Fence             23      Fresno       F        +1 555 555 1111

Example 1:
Now I want to get employee list sorted by employee age.
         SELECT * FROM employee
         ORDER BY e_age;

Example 2:
Now I want to get only female employee list sorted by employee city with descending order.
         SELECT * FROM employee
         WHERE e_sex = ‘F’
         ORDER BY e_city DESC;

Example 3:
Now I want to get employee list sorted by multiple columns like employee city and employee sex.
         SELECT * FROM employee
         ORDER BY e_city, e_sex;

Example 4:
Now I want to get employee list in city Fresno sorted by employee first name with ascending order.
         SELECT * FROM employee
         WHERE e_city = ‘Fresno’
         ORDER BY e_firstname ASC;

Example 5;
Now I want to get employee list sorted by employee first name with descending order and employee last name with ascending order.
         SELECT * FROM employee
         ORDER BY e_firstname DESC, e_lastname ASC;

In this article, we learned about ORDER BY clause with example.


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