descending order sql

1//this_for_descending_order.. 
2 SELECT * FROM TableName ORDER BY columnName DESC;
3 // this_for_ascending_order..
4SELECT * FROM TableName ORDER BY columnName ASC;

1SELECT *
2FROM employees
3ORDER BY employees.employee_id DESC ;
4·        Ascending ( ASC)
5·        Descending ( DESC)

1SELECT q.* 
2    FROM (SELECT TOP 3 * 
3              FROM table 
4              ORDER BY id DESC) q
5    ORDER BY q.id ASC

1SQL order of execution defines the
2execution order of clauses.
3
4-Select
5It starts execution with 
6-from  (Choose and join tables to get base data)
7after from
8-where ( filters base data )
9-group by (Aggregates base data)
10-having (filters aggregated data)
11-select (returns final data)
12-order by (sorts the final data)
13-limit (limits the returned data to a row count)
14
15Only select and from are mandatory

1ORDER BY: is for sorting result
2either in descending or ascending order.