Sorting Using Substrings of Column Values

6.12.1 Problem

You want to sort a set of values using one or more substrings of each value.

6.12.2 Solution

Extract the hunks you want and sort them separately.

6.12.3 Discussion

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

Generating Summaries

Modifying Tables with ALTER TABLE

Obtaining and Using Metadata

Importing and Exporting Data

Generating and Using Sequences

Using Multiple Tables

Statistical Techniques

Handling Duplicates

Performing Transactions

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

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MySQL Cookbook
MySQL Cookbook
ISBN: 059652708X
EAN: 2147483647
Year: 2005
Pages: 412
Authors: Paul DuBois
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