How to drop superuser of PostgreSQL

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I want to delete the user Mark but every time when I use the drop user Mark; command i get this message: enter image description here

or if i try to drop the role i get the same error.

What am I doing wrong? How do I fix this?

Try this:

drop user "Mark";

As role name Mark is not in small case. In postgres if identifiers are not in small case then it must be surrounded by ".

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