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Explain following term: order by clause.
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The SQL ORDER BY clause is used to sort the data in ascending or descending order, based on one or more columns. Some databases sort the query results in an ascending order by default.

Syntax

The basic syntax of the ORDER BY clause is as follows −

SELECT column-list

FROM table_name

[WHERE condition]

[ORDER BY column1, column2, .. columnN] [ASC | DESC];

You can use more than one column in the ORDER BY clause. Make sure whatever column you are using to sort that column should be in the column-list.

Example

Consider the CUSTOMERS table having the following records −

2 Khilan 25 Delhi 1500.00
3 Kaushik 23 Kota 2000.00
4 Chaitali 25 Mumbai 6500.00
5 Hardik 27 Bhopal 8500.00
6 Komal 22 MP 4500.00
7 Muffy 24 Indore 10000.00

The following code block has an example, which would sort the result in an ascending order by the NAME and the SALARY −

SQL> SELECT  FROM CUSTOMERS*

ORDER BY NAME, SALARY;

This would produce the following result −

4 CHAITALI 25 MUMBAI 6500.00
5 HARDIK 27 BHOPAL 8500.00
3 KAUSHIK 23 KOTA 2000.00
2 KHILAN 25 DELHI 1500.00
6 KOMAL 22 MP 4500.00
7 MUFFY 24 INDORE 10000.00

The following code block has an example, which would sort the result in the descending order by NAME.

SQL> SELECT * FROM CUSTOMERS

ORDER BY NAME DESC;

This would produce the following result −