Mysql_ implementing the Rank () function in a group sort-oracle

Assuming the table is student, the data is as follows:

We are going to implement the rank () function in MySQL, which is in-group ordering, specifically: The student table is ranked by the class (course) to the student (name) by score (score).

First create a new stored procedure realize_rank_in_mysql, with the following code:

DROP PROCEDURE IF EXISTS realize_rank_in_mysql;delimiter;; CREATE PROCEDURE realize_rank_in_mysql () BEGIN    DECLARE i int;    SET i = 0;    While I < (select count (DISTINCT course) from student) do            SET @ROW =0;            INSERT into Student_rank            select *, (@ROW: = @ROW + 1) as rank from student            WHERE course= (SELECT DISTINCT course from S Tudent limit i,1)            ORDER by score DESC;            Set i = i + 1;    END while; END;;D Elimiter;

Then enter the following query statement:

drop table if exists student_rank;create table Student_rank like Student;alter table Student_rank add rank int;call Realiz E_rank_in_mysql;select * from Student_rank;

The results are as follows:

Note: The rankings here do not achieve the same number of points in the same situation.