text: /*
  178. Rank Scores
  Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking number should be the next consecutive integer value. In other words, there should be no "holes" between ranks.
  
  +----+-------+
  | Id | Score |
  +----+-------+
  | 1  | 3.50  |
  | 2  | 3.65  |
  | 3  | 4.00  |
  | 4  | 3.85  |
  | 5  | 4.00  |
  | 6  | 3.65  |
  +----+-------+
  For example, given the above Scores table, your query should generate the following report (order by highest score):
  
  +-------+------+
  | Score | Rank |
  +-------+------+
  | 4.00  | 1    |
  | 4.00  | 1    |
  | 3.85  | 2    |
  | 3.65  | 3    |
  | 3.65  | 3    |
  | 3.50  | 4    |
  +-------+------+
  */
  -- DENSE_RANK is not supported on leetcode due to the below 8.0 MySQL version.
  SELECT Score,
         DENSE_RANK() OVER (
                            ORDER BY Score DESC) AS Rank
  FROM Scores
  ;
  
  -- not using window function
  SELECT S1.Score, COUNT(DISTINCT S2.Score) Rank
  FROM Scores S1, Scores S2
  WHERE S1.Score <= S2.Score
  GROUP BY S1.Id
  ORDER BY S1.Score DESC;
  
  