Unique « Constraints « Oracle PL / SQL

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Oracle PL / SQL » Constraints » Unique 
1.if a column is not explicitely defined as not null, nulls can be inserted multiple times
2.Vialate the unique contraint: try to insert the same value
3.A unique constraint can be extended over multiple columns
4.Add unique containt to a varchar2 type column
5.Create a table with 'unique deferrable initially immediate'
6.Add unique constraints
7.ORA-00001: unique constraint (JAVA2S.JOB_UNIQUE_IN_TEAMID) violated
8.Setting a Unique Constraint
9.Unique value column
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