Approach: Using Inner Join

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    First Step: We will first pull distinct score from Scores tables, then will rank them in decreasing order. /* this will be our first table for the inner join*/
    Second Step: We will do inner join between our first table and the base table on score value.

    MYSQL Query:

    c.score as Score,
    CAST(d.rank as signed) as Rank
    Scores c,
    SELECT score, @rank:=@rank+1 AS rank from (select distinct score from Scores order by score desc) as b, (select @rank:=0) as a
    ) d
    where c.score = d.score
    order by c.score desc

     NOTE: Subquery used is for ranking the distinct score value in 
     decreasing order.

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