SQl Random Number Generation and Audit Changes

Hello,

1)  I am using the NewID() to generate the random numbers for one column in sql database table. Does it check for the uniqueness in the database table? This is how I am generating the random number and in the table the column's datatype is given as int.

ABS(CAST(CAST(NEWID() AS VARBINARY) AS INT))

2) On my WebPage, if user edits something, I want to keep track of old data and new data as well. So, What I am doing is , I am just inserting a new record in to the table. Is there any other best way to do this? Something like audit, Which will have everything in it, like what was changed and when was it changed?

Thanks
shahjagatAsked:
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Scott PletcherSenior DBACommented:
>> Does it check for the uniqueness in the database table? <<

Not unless you explicitly create a constraint or an index.  SQL does not by default check any column for uniqueness.



>> Which will have everything in it, like what was changed and when was it changed? <<

In SQL 2008 you can use Change Data Capture (cdc).
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HainKurtSr. System AnalystCommented:
this is fine

ABS(CAST(CAST(NEWID() AS VARBINARY) AS INT))

but you may get same numbers (low probability but possible)

use auto number... don't create random number...
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shahjagatAuthor Commented:
Scott,

Thanks for the Information. I tried using the CDC to track all the changes. After i enabled the CDC, i made some changes and i am having a problem when i am checking the logs. I posted a question. Can you see the link below.

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Microsoft SQL Server 2008

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