我有一个表在某些列上创建了一些过滤的非群集,例如:
CREATE UNIQUE NONCLUSTERED INDEX [IX_Sh_Esh] ON [dbo].[My_Tbl]
(
[City_Code] ASC,
[Sh_Esh] ASC
)
WHERE ([Sh_Bod]=(0) AND [Noe_Fa]=(0))
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
和
CREATE UNIQUE NONCLUSTERED INDEX [IX_Kho] ON [dbo].[My_Tbl]
(
[City_Code] ASC,
[Kho] ASC
)
WHERE ([Sh_Bod]=(0) AND [Sh_Esh]=(0) AND [Noe_Fa]=(1))
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
我在我的表上创建了这个索引而没有错误,但是当我想添加一个新列时,我收到了这个错误:
'My_Tbl' table
- Unable to create index 'IX_Sh_Esh'.
The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'My_Tbl' and the index name 'IX_Sh_Esh'. The duplicate key value is (3, 0).
声明已经终止。
我的表数据是:
根据第一个索引,因为第1行和第4行不满足cluase不应该在其上创建索引。为什么我得到上述错误?
感谢
编辑1):
有趣点。如果我删除该索引并添加列然后重新创建该索引,则索引创建时没有错误.STRANGE !!!!
答案 0 :(得分:1)
您可以删除索引然后添加数据,然后重新创建索引的原因是因为创建索引不会检查现有数据,只检查您尝试插入/更新的数据。
您没有收到错误,因为它是一个过滤的索引,您正在获取它,因为它是一个唯一索引,并且您尝试将重复值添加到唯一索引所在的表列中。这是他们的好消息!如果您需要重复数据,请不要使索引唯一。