Sometimes in Oracle, we have a lot more data but in an unorganized form. ORDER BY is a solution to this issue. The Clause in Oracle is used to sort the data in ascending or descending order.
Select Column from Table_name ORDER BY Column_To_Be_Sorted asc/desc;
NOTE: By default the columns are sorted by ascending order.
Example: Sort single column through ORDER BY
We have a Stu Table in which we want to see the names arranged in ascending order. Refer below for the Stu Table:
Now to Sort the Name column, Code is as follows:
Select * from Stu Order by Name asc;
Example: Sort multiple column through ORDER BY
Now, In Stu Table we want both Name and Roll_No to be sorted in descending order. The code is as follows:
Select * from stu Order by Name desc, Roll_No desc;
Note the above output, you will find that the Name column is sorted in descending order. However, column Roll_No is not correctly sorted in Descending Order. Why? What is the reason behind this Output?
Well, this is how ORDER BY works. The column that is placed just after Order By keyword in Code is always perfectly sorted. For next column it depends that is it the independent column or not. If it is not it will sorted as shown in the output.