MySQL dense_rank 不跳号

Question

我是 MYSQL 的新手，我在使密集排名正常工作时遇到问题，我希望有人能够帮助调整我的查询以获得所需的结果。我遇到的问题是在相同的排名之后进入下一个数字而不是跳过一个数字。我在下面显示了当前结果和期望的结果。

        SELECT  gameid,
            score
         , IF(score <> @pscore,@i:=@i+1,@i:=@i) rank
         , @pscore := score          
        FROM playerstats x
        , (SELECT @i:=0,@prev:='',@pscore:='') vars 
        ORDER 
        BY score DESC;

当前结果：

期望的结果：

Answer 1

基本上你需要在排序之前对 tdata 进行排序。 MySQL

CREATE TABLE playerstats  (
  `Score` INTEGER,
  `Player` VARCHAR(11)
);

INSERT INTO playerstats 
  (`Score`, `Player`)
VALUES
  ('2543', 'jkoffa'),
  ('2204', 'probins'),
  ('2010', 'rwatson'),
  ('2010', 'nbk'),
  ('2010', 'tthamos'),
  ('1950', 'en,acdonald'),
  ('1927', 'dmaginis');

SELECT
`Player`
,IF(@score <> `Score` , @rn := @rn + @cor +1, @rn:= @rn) rnknumber
,IF(@score = `Score` , IF(@cor > 0,@cor := @cor +1,@cor := 1), @cor := 0) correction
,@score := `Score` 'Score'
FROM
(SELECT `Score`, `Player` FROM playerstats ORDER BY Score DESC) t1
, (SELECT @score := -1) t2
,(SELECT @rn := 0) t3,(SELECT @cor := 0) t4

Player      | rnknumber | correction | Score
:---------- | :-------- | ---------: | ----:
jkoffa      | 1         |          0 |  2543
probins     | 2         |          0 |  2204
rwatson     | 3         |          0 |  2010
nbk         | 3         |          1 |  2010
tthamos     | 3         |          2 |  2010
en,acdonald | 6         |          0 |  1950
dmaginis    | 7         |          0 |  1927

db<>fiddle here

对于 Mariadb 10.3

CREATE TABLE playerstats  (
  `Score` INTEGER,
  `Player` VARCHAR(11)
);

INSERT INTO playerstats 
  (`Score`, `Player`)
VALUES
 ('2010', 'tthamos'),
  ('1950', 'acdonald'),
  ('1927', 'dmaginis'),
  ('2010', 'nbk'),
  ('2543', 'jkoffa'),
  ('2204', 'probins'),
  ('2010', 'rwatson');

SELECT
`Player`
,IF(@score <> `Score` , @rn := @rn + @cor +1, @rn:= @rn ) rnknumber
,IF(@score = `Score` , IF(@cor > 0,@cor := @cor +1,@cor := 1), @cor := 0) correction
,@score := `Score` 'Score'
FROM
(SELECT `Score`, `Player` FROM playerstats ORDER BY Score DESC LIMIT 18446744073709551615) t1
, (SELECT @score := -1) t2
,(SELECT @rn := 0) t3,(SELECT @cor := 0) t4

Player   | rnknumber | correction | Score
:------- | :-------- | ---------: | ----:
jkoffa   | 1         |          0 |  2543
probins  | 2         |          0 |  2204
tthamos  | 3         |          0 |  2010
nbk      | 3         |          1 |  2010
rwatson  | 3         |          2 |  2010
acdonald | 6         |          0 |  1950
dmaginis | 7         |          0 |  1927

db<>fiddle here

Answer 2

nbk - 很抱歉图片下次会确保使用文字。再次感谢您的宝贵时间。不幸的是，它只有在以正确顺序输入数据时才有效。如果您要将最后三个条目放在第一位，那么 tthomos 将运行ked #1。

CREATE TABLE playerstats  (
  `Score` INTEGER,
  `Player` VARCHAR(11)
);

INSERT INTO playerstats 
  (`Score`, `Player`)
VALUES
  ('2010', 'tthamos'),
  ('1950', 'acdonald'),
  ('1927', 'dmaginis'),
  ('2543', 'jkoffa'),
  ('2204', 'probins'),
  ('2010', 'rwatson');

然后运行:

SELECT
`Player`
,IF(@score <> `Score` , @rn := @rn + @cor +1, @rn:= @rn) rnknumber
,IF(@score = `Score` , @cor := 1, @cor := 0) correction
,@score := `Score` 'Score'
FROM
(SELECT `Score`, `Player` FROM playerstats ORDER BY Score DESC) t1
, (SELECT @score := -1) t2
,(SELECT @rn := 0) t3,(SELECT @cor := 0) t4

你会得到：

tthamos   1     0   2010
acdonal   2     0   1950
dmaginis  3     0   1927
jkoffa    4     0   2543
probins   5     0   2204
rwatshon  6     0   2010

MySQL dense_rank 不跳号

MySQL dense_rank not skipping numbers

mysql

dense-rank

mariadb-10.3