sql order of operations

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 DISTINCT column, AGG_FUNC(column_or_expression), …
2FROM mytable
3    JOIN another_table
4      ON mytable.column = another_table.column
5    WHERE constraint_expression
6    GROUP BY column
7    HAVING constraint_expression
8    ORDER BY column ASC/DESC
9    LIMIT count OFFSET COUNT;

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

1Used to sort the result data in ascending (default) or descending order
2through the use of ASC or DESC keywords.
3Example: Returns countries in alphabetical order.
4SELECT * FROM countries
5ORDER BY name;

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