根据单个字段查询重复

select shop_order_id,count(shop_order_id) from ec_oms_order group by shop_order_id having count(shop_order_id) > 1

根据多个字段查询重复

select shop_order_id,shop_code,count(1) from ec_oms_order group by shop_order_id,shop_code having count(1) > 1

 

select * from tablename where id in (    
select id from tablename    

group by id    
having count(id) > 1    
)
转载于:https://www.cnblogs.com/jiayongchao/p/4271980.html

表全部数据
-------------------
1 查询people_no重复的记录
select * from people
where people_no in (select   people_no from   people group by   people_no having count(people_no) > 1);
----------------------
2 查询people_no重复的记录 ，排除最小id，如果删除改为delete from
select * from people
where people_no in (select   people_no from people group by   people_no   having count(people_no) > 1) and
id not in (select min(id) from   people group by people_no having count(people_no)>1);
-----------------------------
3 查询people_no people_name重复的记录
select * from people a
where (a.people_no,a.people_name) in (select people_no,people_name from people GROUP BY people_no,people_name HAVING count(*)>1);
-----------------------------------
4 查询people_no people_name重复的记录，排除最小id
select * from people a
where (a.people_no,a.people_name) in (select people_no,people_name from people GROUP BY people_no,people_name HAVING count(*)>1) and
a.id not in    (select min(id) from people GROUP BY people_no,people_name HAVING count(*)>1);
来源：https://www.cnblogs.com/LDDXFS/p/9867928.html

学习目标：

MySQL 查询重复数据

学习内容：

create DATABASE exercise;

CREATE TABLE test (

    id INT NOT NULL PRIMARY KEY,

    DAY date NOT NULL

);

INSERT INTO test (id, DAY)

VALUES

    (1, '2006-10-08');

INSERT INTO test (id, DAY)

VALUES

    (2, '2006-10-08');

INSERT INTO test (id, DAY)

VALUES

    (3, '2006-10-09');

select * from test;

查询结果：

 



查询数据重复的值：

SELECT

    *

FROM

    test

WHERE

    `DAY` IN (

        SELECT

            `DAY`

        FROM

            test

        GROUP BY

            `DAY`

        HAVING

            COUNT(`DAY`) > 1

    );