Auto increment is a database feature that automatically generates a new numeric value when a row is inserted. Different database systems use different implementations such as IDENTITY or sequences.
Automatically generated identifiers reduce manual work and help create unique surrogate keys.
When a new employee is inserted, the database can automatically generate EmployeeID rather than requiring the application to provide it.
CREATE TABLE Employees (
EmployeeID INT GENERATED ALWAYS AS IDENTITY,
EmployeeName VARCHAR(100),
Salary DECIMAL(12,2)
);Auto-generated identifiers are commonly used for employees, customers, orders, products, transactions, and other database records.
- Auto increment generates values automatically.
- It is commonly used for numeric identifiers.
- Syntax differs across databases.
- It reduces manual identifier generation.
- It is often used for surrogate keys.
What is auto increment?
Auto increment automatically generates a new numeric value when a record is inserted.
Is auto increment syntax the same in every database?
No. Different databases use features such as IDENTITY, AUTO_INCREMENT, or sequences.