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  1. #1
    Member
    Join Date
    Jul 2017
    Posts
    44

    constraints available in SQL ?

    Hello Dear,

    Please Tell Me What are the constraints available in SQL ?

  2. #2
    Senior Member
    Join Date
    Sep 2016
    Location
    Manchester
    Posts
    307

    Re: constraints available in SQL ?

    There are 2 types of constraints in SQL.
    1. Column Level Constraints : Limits only column level data
    2. Table Level Constraints: Limits total table data.

  3. #3
    Senior Member
    Join Date
    Sep 2018
    Posts
    242

    Re: constraints available in SQL ?

    NOT NULL - Ensures that a column cannot have a NULL value.
    UNIQUE - Ensures that all values in a column are different.
    PRIMARY KEY - A combination of a NOT NULL and UNIQUE.
    FOREIGN KEY - Uniquely identifies a row/record in another table.


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