ORDER BY Clause 

The ORDER BY clause allows to retrieve the rows of a result set in a specified order.

It is good programming style to use an ORDER BY clause only if the database can cheaply do the sorting using a suitable index.

Syntax

<order by clause> ::=          ORDER BY <sort specification>                        ( ',' <sort specification> )*. <sort specification> ::=          <display name> ( ASC | DESC )?.

<display name> is the name of a column in the result set. Ordering with respect to undefined <display name>s is not possible as this column cannot be named in a <sort specification>.

If a <display name> is ambiguous (e.g. the same name is used in different <as clause>'s in the same statement) it cannot be used in a <sort specification>.

Example

SELECT employee_name, salary AS sal                FROM employees               ORDER BY sal DESC

ORDER BY Clause. This query selects the name and the salary of all employees. The result set is sorted descending by the salary.

See

Select List