Mysql中最高记录点数

Question

我的桌子

+------+-------+--------+
| NAME | MARKS | POINTS |
+------+-------+--------+
| S1   |    53 | (null) |
| S2   |    55 | (null) |
| S3   |    56 | (null) |
| S4   |    55 | (null) |
| S5   |    52 | (null) |
| S6   |    51 | (null) |
| S7   |    53 | (null) |
+------+-------+--------+

参考:http://www.sqlfiddle.com/#!2/5d046/1

我想在最高分上加3,2,1分.这里S3到3点,S2,S4到2点,S1,S7到1点.

最终输出看起来,

+------+-------+--------+
| NAME | MARKS | POINTS |
+------+-------+--------+
| S1   |    53 |   1    |
| S2   |    55 |   2    |
| S3   |    56 |   3    |
| S4   |    55 |   2    |
| S5   |    52 |   0    |
| S6   |    51 |   0    |
| S7   |    53 |   1    |
+------+-------+--------+

Plz的帮助

Answer 1

您可以通过变量（请参阅其他答案中的示例）或通过case：

select 
  myTable.*,
  case
    when max1.marks is not null then 3
    when max2.marks is not null then 2
    when max3.marks is not null then 1
    else 0
  end as score
from
  myTable
  LEFT JOIN
  (select marks from myTable order by marks desc limit 1) AS max1
  ON myTable.marks=max1.marks
  LEFT JOIN
  (select marks from myTable order by marks desc limit 2,1) AS max2
  ON myTable.marks=max2.marks
  LEFT JOIN
  (select marks from myTable order by marks desc limit 3,1) AS max3
  ON myTable.marks=max3.marks;

该演示可以在这里找到。