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使用sql sErvEr 怎么查重复数据

selectid,name,memo fromA whereidin(selectidfromAgroupbyidhavingcount(1)>=2) 1查询 abcd相同的记录: select * from F where a=b and b=c and c=d 2查询有重复数据的记录 select * from F group by a,b,c,d having count(*)>1 3取出数据过滤...

select * from 表 where 字段 in( select 字段 from 表 group by 字段 having count(1)>1)

select * from tablename where 重复字段1 in (select 重复字段1 from tablename group by 重复字段1,重复字段2 having count(*)>1)

1.查询出重复记录 select 重复记录字段 form 数据表 group by houseno having count(重复记录字段)>1 2.重复记录只显示一条ID值最小或最大的记录 select id,* from 数据表 where houseno (select 重复记录字段 form 数据表 group by 重复记录 ...

按照内容进行分组,查询记录数是否大于1 select * from (select datatime,code,name,count(*) as nrow from table1 group by datatime,code,name) tawhere ta.nrow>1

select id,name,age from 表 group by id,name,age having count(1)>=2

select * from stuinfo where stuid in ( select stuid from stuinfo group by stuid having(count(*))>1 ) 或者 select stuid,stuname from stuinfo group by stuid,stuname having(count(*))>1 参见http://kb.cnblogs.com/page/94862/

--查询指定条件下的重复次数--测试数据with tabname(id,name) as (select 1,'name1' union allselect 1,'name1' union allselect 1,'name1' union allselect 1,'name2' union allselect 1,'name2' union allselect 1,'name3' union allselect 2,...

比如重复字段是 A 表 的 name 字段 select name from A group by name having count(name)>1 显示的就是 重复数 大于 1 的 name了 如果你要查看重复的数据 外面就加个 in name select * from A where name in( select name from A group by name...

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