Setting a Unique Constraint : Unique « Constraints « Oracle PL / SQL

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Oracle PL / SQL » Constraints » Unique

Setting a Unique Constraint


   

SQL>

SQL>

SQL> CREATE TABLE myTable (

  2     Name    VARCHAR(50) NOT NULL,

  3     PhoneNo VARCHAR(15) DEFAULT 'Unknown Phone' NOT NULL,

  4     CONSTRAINT MyUniqueKey UNIQUE (Name)

  5  );



Table created.



SQL>

SQL> drop table myTable;



Table dropped.



SQL>

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.	Unique value column

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