WEB DEVELOPER SITE
HTMLCSSJAVASCRIPTSQLPHPBOOTSTRAPJQUERYANGULARXML
 

SQL AUTO INCREMENT Field


Auto-increase enables a one of a kind number to be produced when another record is embedded into a table.


AUTO INCREMENT a Field

Very regularly we might want the estimation of the essential key field to be made consequently every time another record is inserted.

We might want to make an auto-increase field in a table.


Syntax for MySQL

The following SQL explanation characterizes the "ID" segment to be an auto-increase essential key field in the "Persons" table:

Make TABLE Persons
(
ID int NOT NULL AUTO_INCREMENT,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Telephone varchar(255),
City varchar(255),
Essential KEY (ID)
)

MySQL utilizes the AUTO_INCREMENT catchphrase to play out an auto-increase feature.

By default, the beginning an incentive for AUTO_INCREMENT is 1, and it will increase by 1 for each new record.

To let the AUTO_INCREMENT succession begin with another esteem, utilize the accompanying SQL statement:

Adjust TABLE Persons AUTO_INCREMENT=100

To embed another record into the "Persons" table, we won't need to determine an incentive for the "ID" section (a one of a kind esteem will be included automatically):

Supplement INTO Persons (FirstName,LastName)
Qualities ('Austin','McCollum')

The SQL explanation above would embed another record into the "Persons" table. The "ID" segment would be alloted an interesting quality. The "FirstName" segment would be set to "Austin" and the "LastName" section would be set to "McCollum".


Syntax for SQL Server

The following SQL articulation characterizes the "ID" segment to be an auto-increase essential key field in the "Persons" table:

Make TABLE Persons
(
ID int IDENTITY(1,1) PRIMARY KEY,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Telephone varchar(255),
City varchar(255)
)

The MS SQL Server utilizes the IDENTITY catchphrase to play out an auto-increase include.

In the precedent over, the beginning an incentive for IDENTITY is 1, and it will augment by 1 for each new record.

Tip: To determine that the "ID" section should begin at esteem 10 and augmentation by 5, change it to IDENTITY(10,5).

To embed another record into the "Persons" table, we won't need to determine an incentive for the "ID" section (a special esteem will be included automatically):

Supplement INTO Persons (FirstName,LastName)
Qualities ('Austin','McCollum')

The SQL explanation above would embed another record into the "Persons" table. The "ID" segment would be allocated a novel esteem. The "FirstName" section would be set to "Austin" and the "LastName" section would be set to "McCollum".


Syntax for Access

The following SQL proclamation characterizes the "ID" section to be an auto-increase essential key field in the "Persons" table:

Make TABLE Persons
(
ID Integer PRIMARY KEY AUTOINCREMENT,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Telephone varchar(255),
City varchar(255)
)

The MS Access utilizes the AUTOINCREMENT catchphrase to play out an auto-increase highlight.

By default, the beginning an incentive for AUTOINCREMENT is 1, and it will augment by 1 for each new record.

Tip: To determine that the "ID" segment should begin at esteem 10 and augmentation by 5, change the autoincrement to AUTOINCREMENT(10,5).

To embed another record into the "Persons" table, we won't need to determine an incentive for the "ID" segment (a special esteem will be included automatically):

Supplement INTO Persons (FirstName,LastName)
Qualities ('Austin','McCollum')

The SQL explanation above would embed another record into the "Persons" table. The "P_Id" segment would be allocated a one of a kind esteem. The "FirstName" segment would be set to "Austin" and the "LastName" section would be set to "McCollum".


Syntax for Oracle

In Oracle the code is somewhat more tricky.

You should make an auto-increase field with the grouping object (this item produces a number sequence).

Use the accompanying CREATE SEQUENCE syntax:

Make SEQUENCE seq_person
MINVALUE 1
Begin WITH 1
Addition BY 1
Reserve 10
Addition INTO Persons (ID,FirstName,LastName)
Qualities (seq_person.nextval,'Austin','McCollum')

The SQL articulation above would embed another record into the "Persons" table. The "ID" section would be doled out the following number from the seq_person grouping. The "FirstName" segment would be set to "Austin" and the "LastName" section would be set to "McCollum".