How to implement SQL in descending order?

In SQL, the ORDER BY clause allows you to sort the query results by a specified column. To sort in descending order, you can specify the column to be sorted in the ORDER BY clause and add the DESC keyword after the column name.

Here is an example, suppose there is a table named students with columns for name and age, we want to sort it in descending order by age.

SELECT name, age
FROM students
ORDER BY age DESC;

In the above example, ORDER BY age DESC means sorting the query results in descending order based on the age column.

To sort multiple columns, you can specify multiple column names in the ORDER BY clause separated by commas. The sorting process will prioritize the first column, and if there are identical values, it will then sort by the second column, and so on.

SELECT name, age
FROM students
ORDER BY age DESC, name ASC;

In the above example, ordering by age in descending order, and then by name in ascending order, means sorting the list by age in descending order first. If there are any identical ages, they will then be sorted by name in ascending order.