应该是in关键字不支持多字段吧,你这样试一下select * from shiyan003 a where exists (select 1 from (select xm, sfzhm from shiyan003 group by xm, sfzhm having count(*) > 1) s where xm = xm and sfzhm = sfzhm)
SELECT 某一列, COUNT( 某一列 )FROM 表GROUP BY 某一列HAVING COUNT( 某一列 ) 〉1这样查询出来的结果, 就是 有重复, 而且 重复的数量。
插入的时候 ,重复的数据不插入就可以了哦表应该有主键吧!
可以看看数据库嵌套查询之类;select * from B where phonenumber in(select phonenumber from A);其中的* 可以改成你要的名字,住址之类; A,B代表两个表; phonenumber代表两表中存电话号码的列名;试一下。
不要加DISTINCT 就可以了
以WPS 2019版为例第①步:打开需要查找重复项的表格,依次点击“数据”--->“高亮重复项”第②步:在弹出的“高亮显示重复值”中选中区域,单击确定第③步:效果显示如下~
查看可用如下方法:1、创建测试表,插入数据:create table product(id int,name varchar(10),totol int)insert into product values (1,'香蕉',100)insert into product values (2,'橘子',67)insert into product values (3,'葡萄',89)insert into product values (4,'苹果',235)insert into product values (5,'香蕉',77)insert into product values (6,'芒果',34)insert into product values (7,'葡萄',78)insert into product values (8,'梨',24)表中数据如:2、如果查询name列有重复的数据,可执行sql语句:select * from product where name in (select name from product group by name having COUNT(*)>1)说明:查询的结果就是香蕉和葡萄在表中是有重复的,要把香蕉和葡萄的所有记录都查询出来,结果如图:
我一般用这个:假设怀疑重复的字段名为SeriNo,select * from [tablename] group by SeriNohaving count(SeriNo)<>1
(适用于ms sql server)我相信很多人都是想知道,如何能查出所有字段完全重复的记录。如果一个表只有三个字段,把字段名全部输入,是比较简单的,比如可以这样:select 字段1,字段2,字段3 from 记录表 group by 字段1,字段2,字段3 having count(*)>1但工作中可能会遇到有些表有几十个字段,一个一个输入很麻烦,则可以这样:select fname into #temp from syscolumns where id=object_id('记录表')declare @x varchar(1000)SELECT @x= stuff((SELECT ','+fname from #temp for xml path('')),1,1,'')drop table #tempexec('select '+@x+' from 记录表 group by '+@x+' having count(*)>1')也可以分开一步一步来,先自动生成一个列名的字符串,再手工复制到最后一个语句中执行,不需要使用exec命令
我的想法是比较count(列)和count(distinct 列)是否相等。不知道大家有没有更好的方法。
可以看看数据库嵌套查询之类;select * from B where phonenumber in(select phonenumber from A);其中的* 可以改成你要的名字,住址之类; A,B代表两个表; phonenumber代表两表中存电话号码的列名;试一下。
SELECT 某一列, COUNT( 某一列 )FROM 表GROUP BY 某一列HAVING COUNT( 某一列 ) 〉1这样查询出来的结果, 就是 有重复, 而且 重复的数量。
selectid,name,memofromAwhereidin(selectidfromAgroupbyidhavingcount(1)>=2)1查询 abcd相同的记录:select * from F where a=b and b=c and c=d2查询有重复数据的记录select * from F group by a,b,c,d having count(*)>13取出数据过滤到重复的数据select distinct a,b,c,d from f
列出表中某字段有重复的记录,每条记录后面带重复次数。 例如: id name -------- 1 aaa 2 bbb 3 ccc 4 bbb 5 aaa 6 aaa 7 ccc 8 ddd 9 eee 查询结果应如下: id name repeat ----------------- 1 aaa 3 5 aaa 3 6 aaa 3 2 bbb 2 4 bbb 2 3 ccc 2 7 ccc 2 第一种解决方案:SELECT Aid, Aame, BpeatFROM Table_1 AS A INNER JOIN (SELECT name, COUNT(*) AS repeat FROM Table_1 GROUP BY name) AS B ON Aame = BameWHERE (Bpeat > 1)ORDER BY Aame, Aid第二种解决方案:SELECT name, COUNT(*) AS repeatFROM Table_1GROUP BY nameHAVING (COUNT(*) > 1)我觉得你应该把表和字段列出来,这样别人的回答可以更明晰化哪几个字段或者哪个字段要查重的?
查询重复数据,方法如下:select * from [表A] where id in (select id from [表A] group by id having count(id) >1 )
SELECT *, count(*) AS CCCFROM 表明GROUP BY 字段ORDER BY CCC DESC
select id ,name,gander from table where 1=1 group by id ,name,gander
DELETE B FROM A,B WHERE Abid=Bbid and Aitemid=Bitemid
我有两个表,这两个表的结构是完全相同的。 我现在想从这两个表中随机SELECT ming FROM male WHERE num = 1 union (SELECT ming FROM female
select distinct * form 表名