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UNIQUEIDENTIFIER做主键(Primary Key)是一件很方便的事情,在数据合并等操作中有不可替代的优势但是由于普通的GUID的分散性使得如果主键加上聚集索引(Clustered Index)会导致在插入记录时效率大大降低SQL SERVER 2005中新增了一个NEWSEQUENTIALID的函数,MSDN的解释是:在指定计算机上创建大于先前通过该函数生成的任何 GUID 的 GUID。NEWSEQUENTIALID() 不能在查询中引用。您可以使用 NEWSEQUENTIALID() 生成 GUID 以减少叶级别索引上的页争用。但是使用NEWSEQUENTIALID却不是那么一帆风顺1.

error validating the default for column id newsequentialid-78error validating the default for column id newsequentialid-43error validating the default for column id newsequentialid-40error validating the default for column id newsequentialid-47

Having the foreign key automatically assume this empty Guid as a default value when passed a null value would be very handy from several different angles. These foreign keys are non-nullable uniqueidentifier fields.

When I saved the table, I got the same warning, but as P a u l mentioned, you can just click 'yes' to ignore the warning and the table will be saved successfully.

I can't think of a circumstance or reason why it wouldn't succeed.

It succeeded without errors; however, when I reentered the design view and tried to set the column as a 'unique key' index, upon saving the table I got the message: "Error validating the default for column XYZ. ", exactly as described here: There is no reason why I shouldn't be able to call "select newsequentialid()" just as I can call "select newid()".

No one seems to understand why this restriction is in place, and why we have to resort to using temporary table just to acquire a new sequential id.

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