一:創建表

create table userinfo

(

　　id int,

　　name varchar(10),

　　age int,

　　sex int,

　　address varcahr(50)

)

二:添加數據

insert into userinfo values(1,'admin','20,'1','上海市');

insert into userinfo values(2,'admin','20,'1','上海市');

insert into userinfo values(3,'admin','20,'1','上海市');

insert into userinfo values(4,'admin','20,'1','上海市');

insert into userinfo values(4,'admin','20,'1','上海市');

commit;

三:查詢重復的數據

select id, name,age,sex,address from userinfo where (name,age,sex,address) in (select name,age,sex,address from userinfo group by name,age,sex,address having count(1) > 1);

四:保留最小id的一行數據

select id, name,age,sex,address from userinfo where (name,age,sex,address) in (select name,age,sex,address from userinfo group by name,age,sex,address having count(1) > 1) and id not in(select min(id) from userinfo group by name,age,sex,address having count(1) >1);

五:刪除重復數據

delete from usrinfo where id in (select id from userinfo where (name,age,sex,address) in (select name,age,sex,address from userinfo group by name,age,sex,address having count(1) > 1) and id not in(select min(id) from userinfo group by name,age,sex,address having count(1) >1));

commit;

注: 如果沒有id,可以用oracle中的ROWNUM來添加虛擬的id;

轉載于:https://www.cnblogs.com/andy-do/archive/2013/04/12/3015799.html

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