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UniqueConstraint
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Treimin Clark
Ranch Hand
Joined: Nov 12, 2008
Posts: 757
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HeadFirst [surl='http://www.coderanch.com/forums/f-11/EJB-JEE' class='api' title='the JavaRanch JEE forum wrote:EJB[/surl] 3.0 Book]The @Table.UniqueConstraint attribute allows you to specify unique column constraint.
JPA Specs- (9.1.4) wrote:The UniqueConstraint annotation is used to specify that a unique constraint is to be included in the generated DDL for a primary or secondary table.
But I didn't understand what is this "unique column constraint" 
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Christophe Verré
Sheriff
Joined: Nov 24, 2005
Posts: 14685
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It allows to generate unique constraints in the DDL. Unique constraints are explained here. (I don't think this kind of annotation is at the exam, but who knows...)
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Treimin Clark
Ranch Hand
Joined: Nov 12, 2008
Posts: 757
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Christophe Verré wrote:It allows to generate unique constraints in the DDL. Unique constraints are explained here. (I don't think this kind of annotation is at the exam, but who knows...)
Thanks Christophe 
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subject: UniqueConstraint
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