MySQL query results using ORDER BY sort

       ORDER BY clause to sort query results returned by one or more columns. ORDER BY clause syntax is:

ORDER BY {column_name [ASC|DESC]} [,…n]

       Which ASC表示升序，为默认值，DESC为降序. ORDER BY not by ntext, text and image data types sort.
       E.g:

SELECT *
FROM student
ORDER BY age desc,userid ASC

       Further, according to expression can also be sorted.