MySQL_实现组内排序-Oracle中的rank()函数的功能

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 student limit i,1)

            ORDER BY score DESC;

            set i = i + 1;

    END WHILE;

END

;;

DELIMITER ;

drop table if exists student_rank;

create table student_rank like student;

alter table student_rank add rank int;

call realize_rank_in_MySQL;

select * from student_rank;