I require to find the number (or percentage) of questions that have a positive score but received at least one downvote. I think this finding also help to find the alternative case i.e. negative score with an upvote.
According to this query, 593947 Stack Overflow questions have a positive score and at least one downvote. You can use the site switcher below the query to run it for other sites. Feel free to fork the query for other investigations.
Note that SEDE is updated each Sunday morning, so actual numbers might be a little bit higher. It doesn't include deleted questions (which might be relevant for negatively scoring questions with upvotes). If you're new to SQL and/or SEDE, don't forget to take the awesome tutorial.