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  1. #1

    constraints used in Oracle ?

    Hello Dear,

    Please Tell Me What are the various constraints used in Oracle ?

  2. #2
    - not null.
    - primary key.
    - unique.
    - foreign key.
    - check.
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  3. #3
    • NOT NULL. Specifies that this column cannot hold NULL values (constraints of this type are not nameable).
    • PRIMARY KEY. Specifies the column that uniquely identifies a row in the table. ...
    • UNIQUE. Specifies that values in the column must be unique.
    • FOREIGN KEY. ...
    • CHECK.

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