Marvel Wandavision Scarlet Witch Vision 50s Shirt

 The two little minus symbols allow for comments to be included by telling the query language to ignore anything beyond that -- until there is a new line created below the comment. This prevents any additional commands on that line that normally would be performed from being completed and any additional characters from being read on the which would probably cause an error message and possibly roll back or cancel the deletion of the 'Students' table due to a syntax. So the command might normally look something like the below super simple command. Normally they aren't this simple but for illustration purposes I'll keep it simple.

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