1、目的:查询MySQL数据表中,重复记录的值
2、示例:
3、代码:
select serial_num,count(*) as count
FROM card_ticket
GROUP BY serial_num
HAVING count >1
4、结果:
1、目的:查询MySQL数据表中,重复记录的值
2、示例:
3、代码:
select serial_num,count(*) as count
FROM card_ticket
GROUP BY serial_num
HAVING count >1
4、结果: