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求教mysql触发器字段生成流水号

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WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOriginal
2016-06-06 09:39:431014browse

mysql触发器

MySql主键流水号要求8位日期（20150725）+4位顺序号（0001），自增不重复

主键流水号用varchar吗？int好像插入不了12位。

求表结构和触发器的演示，谢谢！

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