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Programming ColdFusion MX, 2nd Edition by Rob Brooks-Bilson

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Charting Multiple Data Series

In ColdFusion 5, one of the biggest complaints about the cfgraph tag was its inability to graph more than a single series of data. For many developers looking to use ColdFusion for creating graphical representations of their data, this limitation was a disappointment. The engineers at Macromedia took this to heart when integrating ColdFusion MX’s new charting engine used by cfchart.

As I mentioned earlier in the chapter, the cfchart tag is capable of graphing up to 16 different series of data in a single chart. When graphing more than one series of data, you can mix and match chart types, with one exception. If you choose to create a pie chart, it can contain only one series of data, and it’s not possible to have both a pie chart and another chart type overlaid.

Consider the need to graph both the average salary in each department and the maximum salary in each department. You can write a single query to return both the average salary and the maximum salary for each department using the AVG( ) and MAX( ) aggregate functions discussed in Chapter 11. Example 17-4 shows the code for the query as well as the code for generating both data series.

Example 17-4. Graphing more than one data series

<cfquery name="GetSalary" datasource="ProgrammingCF"> SELECT Department, AVG(Salary) AS AvgSalary, MAX(Salary) AS MaxSalary FROM EmployeeDirectory GROUP BY Department </cfquery> <h3>Average vs. Max Salary by Department</h3> <cfchart format="Flash" chartheight="360" ...

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