You want to sort a set of values using one or more substrings of each value.
Extract the hunks you want and sort them separately.
This is an application of sorting by expression value (Recipe 6.4). If you want to sort records using just a particular portion of a column's values, extract the substring you need and use it in the ORDER BY clause. This is easiest if the substrings are at a fixed position and length within the column. For substrings of variable position or length, you may still be able to use them for sorting if there is some reliable way to identify them. The next several recipes show how to use substring-extraction to produce specialized sort orders.
Using the mysql Client Program
Writing MySQL-Based Programs
Record Selection Techniques
Working with Strings
Working with Dates and Times
Sorting Query Results
Modifying Tables with ALTER TABLE
Obtaining and Using Metadata
Importing and Exporting Data
Generating and Using Sequences
Using Multiple Tables
Introduction to MySQL on the Web
Incorporating Query Resultsinto Web Pages
Processing Web Input with MySQL
Using MySQL-Based Web Session Management
Appendix A. Obtaining MySQL Software
Appendix B. JSP and Tomcat Primer
Appendix C. References