That's so far into small numbers territory that any comparisons are guaranteed to be overwhelmed by noise.
Edit: In a comment below, this article was linked https://qz.com/37015/how-school-killings-in-the-us-stack-up-.... Indeed, on this scale we see a very different picture!
That number seems suspicious; you'd get a very different answer if your criterion was "any gunshot wound at a school", for example. But that definition might be a better match for what people think of as a school shooting.
(e.g. Northern Ireland had a very large number of terrorist attacks where a warning was given allowing evacuation - would they not count as terrorist incidents even if nobody was killed? I suspect not)