Join the social network of Tech Nerds, increase skill rank, get work, manage projects...
 

  • What is NOT NULL Constraint in MySQL?

    @babita.dhami
    Recommendations Offline Message

    • 0
    • 1
    • 0
    • 1
    • 0
    • 0
    • 0
    • 0
    • 516
    Comment on it

    In MySQL, the NOT NULL constraint is used to restrict a column to NOT accept NULL values.

    The NOT NULL constraint allows a column to always contains a value which means you cant not insert/update a record in a table without passing value for that column on which you have applied the NOT NULL constraint.

    The below statement doesn't allow to "id" column and "first_name" column to accept NULL values:

    Example

    CREATE TABLE emplyee
(
id int NOT NULL,
first_name varchar(45) NOT NULL,
last_name varchar(45),
country varchar(45)
);

    Hope this will help you :)

    mysql database not null constraint
    Comment on it

 0 Comment(s)

Sign In
Forgot Password?
                           OR                           
Create an account !!
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Fill out the form below and instructions to reset your password will be emailed to you:
Reset Password
Fill out the form below and reset your password: