Använder Giorgos fiol...
SELECT name
, marks
, FIND_IN_SET(marks, (SELECT GROUP_CONCAT(marks ORDER BY marks DESC) FROM mytable)) rank
FROM mytable;
| Name | Marks | rank |
|----------|-------|------|
| StudentA | 90 | 1 |
| StudentB | 85 | 2 |
| StudentC | 85 | 2 |
| StudentD | 70 | 4 |
http://sqlfiddle.com/#!9/7cc30/6
eller
SELECT name, marks, rank
FROM (SELECT name
, marks
, @prev := @curr
, @curr := marks
, @i:[email protected]+1 temp
, @rank := IF(@prev = @curr, @rank, @i) AS rank
FROM mytable
, ( SELECT @curr := null, @prev := null, @rank := 0, @i:=0) vars
ORDER
BY marks DESC,name
) x
ORDER
BY marks DESC,name
http://sqlfiddle.com/#!9/287e07/9