Wymuszanie integralność danych

Planning and creating tables requires identifying valid values for the columns and deciding how to enforce the integrity of the data in the columns.SQL Server provides the following mechanisms to enforce the integrity of the data in a column:

• PRIMARY KEY Constraints

• klucz obcy ograniczenia

• UNIQUE Constraints

• CHECK Constraints

• Definicje DEFAULT

• Allowing Null Values

See Also

Concepts

Data Integrity