And, if you want to add the results of different searches to your results, then there are more options.
Append -
(your existing search)
| table trkid myvalues
| append [index=foo your new search | stats count as new_col by trkid]
| stats values(*) as * by trkid
| table trkid myvalues new_col
Join -
(your existing search)
| table trkid myvalues
| join type=left trkid [index=foo your new search | stats count as new_col by trkid]
| fillnull value=0 new_col
| table trkid myvalues new_col
Map -
(your existing search)
| table trkid myvalues
| map search="search index=foo trkid2=$trkid$ | your calculations | eval myvalues=\"$myvalues$\""
| table trkid myvalues new_col
MANY more options...
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