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Questions tagged unique-key

5 questions

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307
votes
15
answers

Difference between primary key and unique key

mysql sql database primary-key unique-key
asked 2012-03-05T11:39:53.707
9
votes
1
answers

Fluent NHibernate 3 uniquekey custom constraint name

fluent-nhibernate constraints unique-key
asked 2011-05-31T15:03:33.897
266
votes
4
answers

INSERT ... ON DUPLICATE KEY (do nothing)

mysql sql unique-key
asked 2011-01-04T17:13:28.567
32
votes
2
answers

Is it bad to use user name as primary key in database design?

mysql database-design primary-key unique-key
asked 2009-12-01T11:37:08.250
9
votes
5
answers

How can I enforce a constraint only if a column is not null in Postgresql?

postgresql constraints unique-key
asked 2009-02-23T22:42:11.240