August 2001
Intermediate to advanced
976 pages
38h 8m
English
Content preview from Programming ColdFusion
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Grouping Output
The CFOUTPUT tag
has an attribute called GROUP that lets you to
group output from your record sets before displaying it to the
browser. There are two ways to use the GROUP
attribute of the CFOUTPUT tag. The first method
uses GROUP to remove any duplicate rows from the
query result set.[7] This is useful in
situations where the result set you return from a query contains
duplicate rows of data but you want to display only unique records.
Example 4-3 demonstrates what happens when you query
a table containing duplicate values and output the results without
using the GROUP attribute of the
CFOUTPUT tag.
Example 4-3. Failing to Use the GROUP Attribute Results in Duplicate Values in the Output
<CFQUERY NAME="GetDepartment" DATASOURCE="ProgrammingCF">
SELECT Department
FROM EmployeeDirectory
ORDER BY Department
</CFQUERY>
<HTML>
<HEAD>
<TITLE>Using GROUP to remove duplicate records</TITLE>
</HEAD>
<BODY>
<H2>Departments:</H2>
<CFOUTPUT QUERY="GetDepartment">
#Department#<BR>
</CFOUTPUT>
</BODY>
</HTML>As you can see in Figure 4-2, executing the template results in many of the same values being output more than once.
Figure 4-2. Duplicate records are displayed because GROUP wasn’t used
This is easy enough to fix. To remove the duplicates from the output,
all you have to do is modify the line of code containing the
CFOUTPUT tag to read like this:
<CFOUTPUT QUERY="GetDepartment" ...
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