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SQLServer Primary Keys

Creating a Primary Key


CREATE TABLE Employees (
 Id int NOT NULL,
 PRIMARY KEY (Id),
 ...
);

This will create the Employees table with 'Id' as its primary key. The primary key can be used to uniquely identify the rows of a table. Only one primary key is allowed per table.

A key can also be composed by one or more fields, so called composite key, with the following syntax:

CREATE TABLE EMPLOYEE (
 e1_id INT,
 e2_id INT,
 PRIMARY KEY (e1_id, e2_id)
)


Conclusion

In this page (written and validated by ) you learned about SQLServer Primary Keys . What's Next? If you are interested in completing SQLServer tutorial, your next topic will be learning about: SQLServer Indexes.



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