查询表中同一字段数据相同的数据

create database tb_demo
create table tb_test
(
id int identity(1,1) primary key,
name varchar(100),
old int,
createtime datetime
)

insert into tb_test(name,old) values('aaa',34)
insert into tb_test(name,old) values('bbb',23)
insert into tb_test(name,old) values('ccc',1)
insert into tb_test(name,old) values('aaa',23)
insert into tb_test(name,old) values('aaa',3)

select * from tb_test

select   *   from   tb_test   
where   name   in   
(select   name   from   tb_test   group   by   name   having     count(name)> 1)