Unique value column : Unique « Constraints « Oracle PL / SQL

Oracle PL / SQL

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Oracle PL / SQL » Constraints » Unique

Unique value column


   



SQL>

SQL>

SQL>

SQL> create table t  ( x int unique );



Table created.



SQL> insert into t values ( 1 );



1 row created.



SQL> insert into t values ( 2 );



1 row created.



SQL> update t set x = x+1;



2 rows updated.



SQL>

SQL> drop table t;



Table dropped.



SQL>

Related examples in the same category

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

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