What does the following query how:
~~~~~
SELECT min(NumDeaths+0), DateOfReport
FROM DailyReports
WHERE NumDeaths >= 100
GROUP BY NameOfCountry;
~~~~~
The `+0` on the end of `NumDeaths` ensures that you are dealing with
numbers instead of strings. You might also phrase it as:
~~~~~
.... min(CAST(NumDeaths AS Integer)) ....
~~~~~