Trouble grouping query results

Hi,
I have 3 tables (Cars, Colors, and Cars_Colors). Cars_Colors
is a junction table to list all the possible combinations of cars
and their colors. Using joins, I produce the following results from
my query:
CAR_NUM,COLOR_NUM
Car1, Color1
Car1, Color2
Car2, Color1
Car3, Color1
Car4, Color1
Car4, Color2
Car4, Color3
Car5, Color3
Query works fine, my trouble is getting the results to
display how I want them to. I would like to display the results in
a single <table>, with a separate <tr> for each
distinct car, where that <tr> displays the car in the first
<td> and displays all of the colors associated with that car
in a second <td>. The colors should be separated by commas.
E.g.:
Car1 | Color1, Color2
Car2 | Color2
Car3 | Color1
Car4 | Color1, Color2, Color3
Car5 | Color3
Now, I was able to get it to work by first querying for the
distinct cars in the Cars_Colors table, then loop through each car
result and perform a second query on the colors associated with the
current car. But this surely can't be the most efficient method.
I'd like to use one query to produce the result set I listed
at the top... with all Car/Color combinations, then use Coldfusion
to display the output... without having to run another query every
time through the loop. I've tried using valuelist() but couldn't
get it to work correctly. I've also tried <cfoutput query
group> and <cfloop query>. I've come close with both, just
can't get the commas working right. I don't know how to keep the
comma from appearing at the end of the colors, e.g.:
Car1 | Color1, Color2
Anyone have a better way? I appreciate any help.
Thanks!

<CFQUERY name="myQuery"...>
SELECT .... from ... where...
ORDER BY car_num, color_num
</cfquery>
<cfoutput
query="myQuery" group="car_num">

<cfset tempColors = "" /><cfoutput><cfset
tempColors = listAppend(tempColors, color_num, ", ")
/></cfoutput>
#car# - #ListChangeDelims(tempColors, ", ")#<br />
</cfoutput>
HTH,
CR

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Trouble understanding query results

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Multiple rows will show for the same device if it has multiple CPUs (not to confuse with cores)...
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Group by result in query

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http://codebeaver.blogspot.dk/
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Trouble grouping query results

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