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sql语句查询重复数据

方法如下: select * from 你的表名 a where id=(select min(id) from 你的表名 whereitem_id=a.item_id) 在查询之前先把数据库表中的第一行复制到sid里在去,然后让sid和下面的每一行进行比较 取所有相同的行的最小的一下,也可以取最大的,结...

可用group by……having来实现。 可做如下测试: 1、创建表插入数据: create table test(id int,name varchar(10))insert into test values (1,'张三')insert into test values (2,'李四')insert into test values (3,'张三')insert into test va...

select IDTP,IDNO,CUSTNAME from table where IDTP||IDNO in (select IDTP||IDNO from table group by IDTP,IDNO having count(*)>=2 minus select IDTP||IDNO from table group by IDTP||IDNO,CUSTNAME having count(*)=1) 还有其他写法,稍微...

select id, name, memo from A where id in (select id from A group by id having count(1) >= 2) select id, name, memo from A where id in (select id from A group by id having count(1) >= 2)

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)

select id from 表名 group by id having count(id) >1

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。

查询重复数据的话 直接select * from table_name;就可以了啊 如果是想剔除有重复的数据,select distinct * from table;

查询重复 select [需要排重的列名] from 表名 group by [需要排重的列名] having COUNT(1)>1删除重复 delete from 表名 where [id自增列] in ( select [id自增列] from 表名 a where [需要排重的列名] in ( select [需要排重的列名] from 表名 b...

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