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  • SQL CHECK Constraint

    @pranav.chhabra
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    Comment on it

    It limits the value range which is mentioned in column.

    Example of check constraint

    CREATE TABLE Persons
(
PId int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255),
CONSTRAINT chkPerson CHECK (PId>0 AND City='dehradun')
)

    SQL CHECK Constraint on ALTER TABLE

    ALTER TABLE Emp
ADD CHECK (PId>0)

    To DROP a CHECK Constraint

    ALTER TABLE Emp DROP CHECK chk_Person

    SQL CHECK Constraint
    Comment on it

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