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Duplicate value in Identity column


Duplicate value in Identity column

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AppSup_dba
AppSup_dba
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Comments posted to this topic are about the item Duplicate value in Identity column

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malleswarareddy_m
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hi,

I know that we can add explicit values to an identity column using

Identity_Insert on. but i thought that identify column will not allow duplicate columns.good question.lost one point but learned one new point.

Malleswarareddy
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ziangij
ziangij
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good one... duplicates can only be avoided by having a constraint in place...
Koen Verbeeck
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Nice question. Usually an Identity column is used as a primary key (and thus having a unique clustered index), which will prevent the insertion of duplicate values.


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Christian Buettner-167247
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ziangij (8/15/2010)
good one... duplicates can only be avoided by having a constraint in place...

...or by having a unique index in place.

Best Regards,

Chris Büttner
AppSup_dba
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And i thought i only didnt knew it :-)

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Danny Ocean
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Good Question...

Thanks
Vinay Kumar
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pjdiller
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I have to admint I wouldn't have gotten this one right, except for a similar question a few months ago. I still don't understand why one would want to create an identity and then break the rules of the identity. Seems like trouble :-)
Daniel Bowlin
Daniel Bowlin
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Identity insert can be very dangerous. For a long time I couldn't see a use for it. Then I needed it to get 2 tables in 2 different databases into sync after they had fallen out of sync for some unknown reason. It saved me a lot of effort.
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Only one person can insert identity on a column at a time, so WE can not... Hehe
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