Oracle SQL查找删除重复记录

Oracle SQL查找删除重复记录有两种方式一种是建立一个临时表,就不做说明了.

另一种是用Oracle的rowid来删除:

create table student (
name varchar(12),		--姓名
sex  varchar2(2)		--性别
)

表已建立.

SQL> insert into student values('张三','01');
SQL> insert into student values('李四','01');
SQL> insert into student values('王五','02');

SQL> insert into student  select * from student ;

插入4个记录.

SQL> commit;

完全提交.

SQL> select rowid,name ,sex from student ;

查询到6记录.

查出重复记录
select rowid,name ,sex from student
where student.rowid!=(select max(rowid) from student  t where student.name =t.name and student.sex =t.sex );

删除重复记录
delete from student   where student.rowid!=(select max(rowid) from student  t where student.name =t.name and student.sex =t.sex );

删除3个记录.

select rowid,name ,sex from student
完成!