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  • 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    |
    +-------+------+

    select distinct Score from Scores order by Score desc;

    select 
      tmps.Score,(@rank := @rank + 1) as Rank
    from (
      select
        distinct Score
      from Scores
      order by Score desc
    ) tmps,(select @rank :=0) ind;

    select 
      lef.Score as Score,rig.Rank as Rank
    from Scores lef
        left join
       (select
          tmps.Score ,(@rank := @rank + 1) as Rank
        from (select
              distinct Score
            from Scores order by Score desc) tmps,
           (select @rank :=0) ind
        ) rig
        on lef.Score=rig.Score order by Score desc;

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  • 原文地址:https://www.cnblogs.com/kaibing/p/9164714.html
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