Just a list of distinct computers in the OMS workspace (just returns the count and name rather than all the other details)
Computer=* | Distinct Computer

A similar list to the above but shows the computers sorted by aggregated value (i.e. sorted by computers that have the most data)

Computer=* | measure count () by Computer

Remember that OMS Query Language (OQL) is case sensitive, so this will find a Computer called OM2016


but this example wouldn’t find that machine : Computer=Om*

This also works:

As does a Regular Expression, see more on RegEx here: https://docs.microsoft.com/en-us/azure/log-analytics/log-analytics-log-searches-regex