查詢,實現分數排名,去重顯示。
阿新 • • 發佈:2019-01-11
#建立成績表 CREATE TABLE `tscore` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'id唯一標識 /注:自增', `score` float(11) DEFAULT NULL COMMENT '分數', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='成績表'; insert into tscore (id,score) value (1,3.5); insert into tscore (id,score) value (2,3.65); insert into tscore (id,score) value (3,4.00); insert into tscore (id,score) value (4,3.85); insert into tscore (id,score) value (5,4.00); insert into tscore (id,score) value (6,3.65); #查詢,實現分數排名,去重顯示。 #查詢去重後分數的條件:當前行分數大於等於同表的分數 的count數量, 去重顯示, 然後降序輸出 select Score, (select count(distinct Score) from tscore where Score>=t.Score) as Rank from tscore as t order by Score desc;