You would get more than one entry for a system if there is more than one event. You can try creating it as a chart where system names are one of the labels, or you can group by system name. Otherwise there is no logic to filter it to return only one system name as a table. Tagging option would still work if more than one entry exists for a given system name. You just have to have the query as a table and not a chart, if that is an action you want to take on the query.
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