表结构,数据以下:redis
CREATE TABLE `redis_num_mem` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增id', `cluster_id` int(10) unsigned NOT NULL DEFAULT 0 COMMENT 'Redis集群id', `type` varchar(10) NOT NULL DEFAULT '' COMMENT 'key类型', `number` int(10) unsigned NOT NULL DEFAULT 0 COMMENT 'key的个数', `memory` bigint(20) unsigned NOT NULL DEFAULT 0 COMMENT 'key的存内,单位bytes', `create_time` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp() COMMENT '记录生成时间', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=103 DEFAULT CHARSET=utf8 COMMENT='redis类型表' MariaDB [test]> select * from redis_num_mem; +-----+------------+--------+--------+--------+---------------------+ | id | cluster_id | type | number | memory | create_time | +-----+------------+--------+--------+--------+---------------------+ | 1 | 1 | hash | 47079 | 100 | 2018-10-22 23:48:12 | | 2 | 1 | set | 20608 | 100 | 2018-10-22 23:48:12 | | 3 | 1 | list | 3938 | 100 | 2018-10-22 23:48:12 | | 4 | 1 | string | 17662 | 100 | 2018-10-22 23:48:12 | | 5 | 1 | hash | 46808 | 100 | 2018-10-22 23:48:12 | | 6 | 1 | set | 20854 | 100 | 2018-10-22 23:48:12 | | 7 | 1 | string | 17710 | 100 | 2018-10-22 23:48:12 | | 8 | 1 | list | 3917 | 100 | 2018-10-22 23:48:12 | | 9 | 1 | list | 3854 | 100 | 2018-10-22 23:48:12 | | 10 | 1 | string | 17651 | 100 | 2018-10-22 23:48:12 | | 11 | 1 | hash | 46960 | 100 | 2018-10-22 23:48:12 | | 12 | 1 | set | 20654 | 100 | 2018-10-22 23:48:12 | | 14 | 2 | | 0 | 0 | 2018-10-23 10:34:54 | | 15 | 2 | | 0 | 0 | 2018-10-23 10:35:42 | | 16 | 0 | | 0 | 0 | 2018-10-23 10:50:39 | | 20 | 0 | | 0 | 0 | 2018-10-23 11:05:52 | | 100 | 0 | | 0 | 0 | 2018-10-23 11:05:38 | | 101 | 0 | | 0 | 0 | 2018-10-23 11:06:09 | +-----+------------+--------+--------+--------+---------------------+ 18 rows in set (0.00 sec)
查找全部重复类型的记录:spa
SELECT * FROM redis_num_mem a WHERE ((SELECT COUNT(*) FROM redis_num_mem WHERE type = a.type) > 1) ORDER BY type DESC;
Select * From redis_num_mem Where type In (Select type From redis_num_mem Group By type Having Count(*)>1) ;
select * From redis_num_mem where id in (Select Max(id) From redis_num_mem Group By type);
注:此处显示ID最大一条记录code
delete from redis_num_mem where type in (select type from (select type from redis_num_mem group by type having count(*)>1) as t1);
delete from redis_num_mem where id not in (select * from (select max(id) from redis_num_mem group by type) as t1);
一、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断string
select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
二、删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录hash
delete from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)
三、查找表中多余的重复记录(多个字段)it
select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
四、删除表中多余的重复记录(多个字段),只留有rowid最小的记录test
delete from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
五、查找表中多余的重复记录(多个字段),不包含rowid最小的记录集群
select * from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)