How To Auto Increment In Sql | What is Auto Increment?

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How To Auto Increment In Sql:

Auto increment allows a unique number to be generated automatically when a new record is inserted into a table. Often this is the primary key field that we would like to be created automatically every time a new record is inserted.

What is Auto Increment?:

Auto Increment is a function that operates on numeric data types. I automatically generates sequential numeric values every time that a record is inserted into a table for a field defined as auto increment.

Syntax for MySQL:

The following SQL statements define the “ID” column to be an auto increment primary key field in the “Persons”

CREATE TABLE PERSON;

(ID int NOT NULL AUTO INCREMENT, Last Name Varchar (255) NOT NULL, First Name Varchar (255) Age int, PRIMARY KEY (ID) );

MySQL uses the AUTO INCREMENT keyword to perform an auto increment feature.

By default, the starting value for AUTO INCREMENT is 1, and it will increment by 1 for each record.

To let the AUTO INCREMENT sequence start with another value.

ALTER TABLE

Person AUTO INCREMENT =100;

To insert a new record into the “Persons” Table, we will NOT Have to specif a value for the “ID” column.

INSERT INTO

Persons (First Name, Last Name)

VALUES

(‘Lars’, ‘Monsen’);

Syntax for SQL Server:

The following SQL statement defines the “ID” column to be an auto increment primary key field in the ” Persons”

CREATE TABLE

(ID int IDENTITY (1,1)

PRIMARY KEY

Last NameĀ  Varchar (255)

NOT NULL

First Name Varchar (255)

The MS SQL server uses the IDENTITY keyword to perform an auto increment feature.

To specify that the “ID” column should start at value 10 and increment by 5, change it to IDENTITY (10,5)

To insert a new record into the “Persons”

INSERT INTO

Persons (First Name, Last Name)

VALUES

(‘Lars’, ‘Monsen’);