Count of Value Pairs in URI Query String

[chca]

Assuming my URL_Query field contains the following data:

cdata=153&orgid=0012

orgid=3924&cdata=129

cdata=153&orgid=3924

How can I display a table containing a unique count of value pairs cdata?

cdata   count

153     2

129     1

[gkanapathy]

... | extract auto=true | stats count by cdata

Actually, unless you've done something to turn it off, the fields will usually have been auto extracted by Splunk without you having to call the extract command.

[chca]

I also found this answer:
http://splunk-base.splunk.com/answers/8404/chart-over-query-string

However, I don't have the value pairs pre-parsed. I need to do it during the search.