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  • What is Auto-increment keyword in MySQL?

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    Auto-increment is used to allow a unique number when a new record inserted into a table. Generally we use Auto-increment to create value for primary key field automatically when a new record is inserted into a table.

    Syntax:

    The below statement creates a table named "user" with the column "id" that will be auto-increment primary key field:

    CREATE TABLE user
    (
    id int NOT NULL AUTO_INCREMENT,
    first_name varchar(45),
    last_name varchar(45),
    PRIMARY KEY (id)
    );
    

    The AUTO_INCREMENT keyword is used to increment value in MySQL, by default it's starting value is 1 and increments by 1 every time when a new record is inserted.

    We can start Auto-increment with another value apart from 1 by using the below statement:

    ALTER TABLE user AUTO_INCREMENT=10;
    

    Suppose you want to insert a new record into "user" table then you don't need to define value of id field, it will auto-increment "id" column automatically (a unique value will be assigned to id column) as below:

    INSERT INTO Persons (first_name,last_name)
    VALUES ('John','Simp');
    

    Result

     user
    
    id  first_name                  last_name
    .......................................
    1   John                        Simp              
    

    Hope this will help you :)

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