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SQL重复记录查询(转载) ,及对大数据量的重复数据优化
1、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select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
例二:
select * from testtable
where numeber