ColdFusion Developer's Guide

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query="DataTable"
valueColumn="AvgByDept"
itemColumn="Dept_Name"
/>
This example displays the values in the AvgByDept column of the DataTable query. It displays
the Dept_Name column value as the item label by each bar.
The following table lists the attributes of the cfchartseries tag that you use when working
with queries:
Attribute Description
query The query that contains the data. You must also specify the valueColumn
and itemColumn.
valueColumn The query column that contains the values to be charted.
itemColumn The query column that contains the description for this data point. The
item normally appears on the horizontal axis of bar and line charts, on the
vertical axis of horizontalbar charts, and in the legend in pie charts.
Charting a query of queries
In addition to charting the results of a query, you can also chart the results of a queries of
queries. For more information about using query of queries, see Chapter 24, “Using Query of
Queries.” Query of queries provides significant power in generating the data for the chart. For
example, you can use aggregating functions such as SUM, AVG, and GROUP BY to create a
query of queries with statistical data based on a raw database query. For more information, see
Chapter 24, “Using Query of Queries.”
You can also take advantage of the ability to dynamically reference and modify query data. For
example, you can loop through the entries in a query column and reformat the data to show
whole dollar values.
The example in the following procedure analyzes the salary data in the cfdocexamples
database using a query of queries, and displays the data as a bar chart.
To chart a query of queries:
1. Create a new ColdFusion page with the following content:
SELECT Departmt.Dept_Name,
Employee.Salary
FROM Departmt, Employee
WHERE Departmt.Dept_ID = Employee.Dept_ID
1120 Creating Charts and Graphs