CREATE TABLE `test` ( `student_id` int(10) unsigned NOT NULL AUTO_INCREMENT, `subject` varchar(10) CHARACTER SET latin1 DEFAULT NULL, `score` tinyint(4) DEFAULT NULL, PRIMARY KEY (`student_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (1,1,'yw',80); insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (2,1,'sx',90); insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (3,2,'yw',85); insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (4,2,'sx',95); insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (5,3,'yw',70); insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (6,3,'sx',100); insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (7,4,'yw',70); insert into `test`(`id`,`student_id`,`subject_name`,`score`) values (8,4,'sx',70);
subject_name: 科目 yw:语文 sx:数学
dense_rank
select subject_name as sbn , student_id as sid, score, @rank:=case when @sn <> subject_name then 1 when @score <> score then @rank+1 else @rank+0 end as rank, @sn := subject_name as sn, @score := score as score from `test` p, (select @rank := 0) r, (select @sn := '') u, (select @score := -1) i order by subject_name, score;
result:
sbn sid score rank sn score sx 4 70 1 sx 70 sx 1 90 2 sx 90 sx 2 95 3 sx 95 sx 3 100 4 sx 100 yw 3 70 1 yw 70 yw 4 70 1 yw 70 yw 1 80 2 yw 80 yw 2 85 3 yw 85
rank
select subject_name as sbn, student_id as sid, score, @rank:=case when @sn <> subject_name then 1 when @score <> score then @rank+@range else @rank+0 end as rank, @range:=case when @sn <> subject_name then 1 when @score = score then @range+1 else 1 end as ran , @sn := subject_name as sn, @score := score as sc from `test` p, (select @rank := 0) r, (select @sn := '') u, (select @score := -1) i, (select @range := 1) g order by subject_name, score;
sbn sid score rank ran sn sc sx 4 70 1 1 sx 70 sx 1 90 2 1 sx 90 sx 2 95 3 1 sx 95 sx 3 100 4 1 sx 100 yw 3 70 1 1 yw 70 yw 4 70 1 2 yw 70 yw 1 80 3 1 yw 80 yw 2 85 4 1 yw 85