yes。 看来你们的编号是primary key （或part of primarykey） 不许有重复的

来源: 130131 于 2012-01-05 08:26:07 [] [旧帖] [给我悄悄话] 阅读数 : (445 bytes)
回答: 什么叫 primary key violation？ 由 HenryLi 于 2012-01-05 08:08:32

The primary key of a relational table uniquely identifies each record in
the table. It can either be a normal attribute that is guaranteed to be
unique (such as Social Security Number in a table with no more than one
record per person) or it can be generated by the DBMS (such as a
globally unique identifier, or GUID, in Microsoft SQL Server). Primary
keys may consist of a single attribute or multiple attributes in
combination.

所有跟帖： 

• 谢谢你的解释，听起来非常专业啊。 -HenryLi- ♂ 给 HenryLi 发送悄悄话 HenryLi 的博客首页 (0 bytes) () 01/05/2012 postreply 08:28:09

• copied。：） -130131- ♀ 给 130131 发送悄悄话 (0 bytes) () 01/05/2012 postreply 08:35:26

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