Where cannot we use "default"

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Where cannot we use "default"

kak.mca

Valued Member

Points: 61
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December 21, 2009 at 7:21 pm

#213832

Hi Everybody,
One interviewer asked me this question.
Where cannot we use "default"? What is that column?
Any idea?
Advance thanks.

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Lowell SSC Guru Points: 323506 More actions · Answer 1

a default sets the value of the column, so common sense would make you think of columns that cannot have the same value more than once.

i'd test it to be sure, but off hand i'm thinking columns more than once would be:

a column with identity,

a primary key,

one that has a unique constraint;

columns that the default would conflict with an other constraint.

can you think of any other situations?

Lowell

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kak.mca Valued Member Points: 61 More actions · Answer 2

Hi Lowell,

Thank you very much for your answer. Nice reply.

cthariharan Say Hey Kid Points: 698 More actions · Answer 3

it maybe useful to u -- http://www.blackwasp.co.uk/SQLDefaultColumns.aspx

For better, quicker answers, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/

For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/