sql分组后取每组前三

Posted 2021-05-13 zeran

对数据进行分组，取每组前三条数据

INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'1\', \'张三\', \'50\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'2\', \'张三\', \'60\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'3\', \'张三\', \'70\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'4\', \'张三\', \'66\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'5\', \'张三\', \'55\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'6\', \'张三\', \'77\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'7\', \'李四\', \'32\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'8\', \'李四\', \'45\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'9\', \'李四\', \'33\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'10\', \'李四\', \'28\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'11\', \'李四\', \'60\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'12\', \'李四\', \'55\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'13\', \'王五\', \'99\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'14\', \'王五\', \'107\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'15\', \'王五\', \'88\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'16\', \'王五\', \'65\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'17\', \'王五\', \'72\');
INSERT INTO `sakila`.`tt` (`id`, `name`, `score`) VALUES (\'18\', \'王五\', \'126\');

inster

数据如下

 

 题目：分组取每人最好成绩的前三条

select * from tt as t1 where (select count(*) from tt where name=t1.name and score>=t1.score)<=3 ORDER BY score desc 

题目：取每人最好成绩，按最好成绩排名；取每人最平均成绩，按照平均成绩倒叙排名