count(X)
This function returns the number of occurrences of the field X.
values(X)
This function returns the list of all distinct values of the field X as a multi-value entry. The order of the values is lexicographical.
this is from stats command page.. this will be applicable for tstats as well, i think
http://docs.splunk.com/Documentation/Splunk/latest/SearchReference/CommonStatsFunctions
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