select count(*),oId from afl_taobao_rate group by oId order by count(*) desc
afl_taobao_rate 里面的oid重复,要求重复只留一条
1.建立临时表
create table tmp as select * from afl_taobao_rate group by oId
2.给临时表加uniqu限制
ALTER TABLE tmp ADD unique(`oId`);
3.备份原始表
alter table afl_taobao_rate rename afl_taobao_rate2
4.将临时表 改为目标表
alter table tmp rename afl_taobao_rate