原文:查询和删除表中重复数据sql语句

查询表中重复数据。select from people where peopleId in select peopleId from people group by peopleId having count peopleId gt 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 delete from people where people ...

2016-08-31 22:01 0 14502 推荐指数:

查看详情

删除重复数据sql语句

查询重复数据 select * from employee where employeeId in (select employeeId from employee group by employeeId having count(employeeId) > 1) 删除多余 ...

Tue Jan 21 01:24:00 CST 2020 0 4974
sql语句删除一张重复数据

来自 王涛 同志的指导 DELETE FROM product WHERE searchdate IN (SELECT sd FROM (SELECT a.searchdate sd FROM pr ...

Thu Mar 19 23:55:00 CST 2020 0 602
sql语句查询重复数据(多类型)

名:hztj 字段名:edxzqhdm ,sdxzqhdm 1.查出某一列数据重复的,以sdxzqhdm为例 select * from hztj a where (a.sdxzqhdm) in (select sdxzqhdm from hztj group by sdxzqhdm ...

Wed Feb 16 23:48:00 CST 2022 0 3820
mysql删除完全重复数据的准确SQL语句

删除数据重复的记录,只保留一条 DELETE FROM tb_gps_records WHERE id NOT IN (SELECT bid FROM (SELECT min(id) as bid FROM tb_gps_records GROUP BY busNo,longitude ...

Thu Nov 01 19:21:00 CST 2018 0 3978
SQL Server-删除重复数据

在执行语句时难免会输入相同的数据,这些重复记录不但没有用,还可能导致数据库占用大量资料或导致数据查询索引无效。 如果在建的时候没有设置主键或unique索引,那么插入完全重复数据是不会报错的,结果就是无法修改记录行或者删除记录行。通过SQL语句可以实现删除重复数据。 所有字段均重复 ...

Tue May 31 05:50:00 CST 2022 2 481
sql删除各类重复数据小总结

在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除重复的呢1、查找多余的重复记录,重复记录是根据单个字段(peopleId)来判断 select * from people where peopleId in (select peopleId from people ...

Tue Oct 31 00:25:00 CST 2017 0 1142
sql查询重复数据个数

select train_code,count(1) from tb_ask_trainbodyroadtrain group by train_code having count(1) >1 ...

Tue Apr 11 00:42:00 CST 2017 0 9326
 
粤ICP备18138465号  © 2018-2025 CODEPRJ.COM