How do I Handle Ties When Ranking Results in MySQL?
- by Laxmidi
Hi,
How does one handle ties when ranking results in a mysql query? I've simplified the table names and columns in this example, but it should illustrate my problem:
SET @rank=0;
SELECT student_names.students, @rank := @rank +1 AS rank, scores.grades
FROM student_names
LEFT JOIN scores ON student_names.students = scores.students
ORDER BY scores.grades DESC
So imagine the the above query produces:
Students Rank Grades
Al 1 90
Amy 2 90
George 3 78
Bob 4 73
Mary 5 NULL
William 6 NULL
Even though Al and Amy have the same grade, one is ranked higher than the other. Amy got ripped-off. How can I make it so that Amy and Al have the same ranking, so that they both have a rank of 1. Also, William and Mary didn't take the test. They bagged class and were smoking in the boy's room. They should be tied for last place.
The correct ranking should be:
Students Rank Grades
Al 1 90
Amy 1 90
George 3 78
Bob 4 73
Mary 5 NULL
William 5 NULL
If anyone has any advice, please let me know.
Thank you!
-Laxmidi
