mysql语句

时间：2014-05-28 19:51:21 收藏：0 阅读：386

1：查找某个字段相同

select 
* from 
orders where 
serial_number in 
(
 
select 
serial_number from 
orders
 
group 
by serial_number
 
having 
count(serial_number) > 1
 
)

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