用SQL语句,删除掉重复项只保留一条 在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢 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 people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2.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…

1.如表中没有主键,先添加自动增长主键 alter table 表名 add 列名 int identity (1,1) primary key 2.删除重复数据 delete from 表名 where id not in (select min(id) from 表名 group by id) ------id1为新增自增的列,id为原来没有自增的id列 delete from DeceasedInformation where id1 not in (select MIN(id) from…

1:删除重复数据 --第一步:先找到重复数据 select ProcInstID from record_errorlog group by ProcInstID having count(ProcInstID) > --查看一下 select * from record_errorlog where ProcInstID in (select ProcInstID from record_errorlog group by ProcInstID having count(ProcInstID)…

--用SQL语句,删除掉重复项只保留一条 --在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢 --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 people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) --2.删除表中多余的重复记录,重复记录是根据单个字段(peopleId…

//显示重复的所有条 SELECT * FROM 表名 WHERE (字段1,字段2,...) IN (SELECT 字段1,字段2,...FROM 表名 GROUP BY 字段1,字段2,... HAVING COUNT(*)>1) //只显示重复中的一条 SELECT * FROM 表名 GROUP BY CONCAT(字段1,字段2,...) HAVING COUNT(*)>1 //删除重复数据(保留ID最小的一条) DELETE FROM 表名 WHERE (字段1,字段2,...)…

数据库UserInfo 删除重复数据 即删除重复的用户名手机号 同一个用户名手机号只保留一个用户 01.根据多个字段查询重复数据 with data1 as( select MobilePhone,Name from UserInfogroup by MobilePhone,Namehaving count(*)>1 ), 02.对重复数据分配编号 data2 as ( select u.*,row_number() over(partition by u.MobilePhone,u.Name…

DELETE FROM Bus_TerminalMessage_Keywords WHERE Content IN (select Content from Bus_TerminalMessage_Keywords group by Content having count(Content) > 1) AND ID NOT IN (select min(Id) from Bus_TerminalMessage_Keywords group by Content having count(Cont…

删除重复数据 备份表 删除最早的评论…

SELECT * FROM EnterpriseDataTools.Enterprise.CompanyMainwhere CompanyNo in (select CompanyNo from EnterpriseDataTools.Enterprise.CompanyMain group by CompanyNo having count(CompanyNo) > 1)and Id not in (select max(Id) from EnterpriseDataTools.Enterpr…

select id, name, memofrom Awhere id in (select id from A group by id having count(1) >= 2)…