MySQL数据库表的主键到底是用GUID好，还是INT好？

待补充

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?两遍对比的文章：

http://krow.livejournal.com/497839.html

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?http://www.mysqlperformanceblog.com/2007/03/13/to-uuid-or-not-to-uuid/

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CREATE TABLE Test_Guid
(
Guid varchar(50) not null,
TestId int not null,
TestText ntext not null,
TestDateTime datetime default getdate(),
CONSTRAINT PK_Guid PRIMARY KEY (Guid)
)

应该改成这样吧：

CREATE TABLE Test_Guid
(
Guid uniqueidentifier not null,
TestId int not null,
TestText ntext not null,
TestDateTime datetime default getdate(),
CONSTRAINT PK_Guid PRIMARY KEY (Guid)
)

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