SQL Server Notification Services Question:
Define data, entity, domain and referential integrity?
Answer:
Data Integrity
Data Integrity validates the data before getting stored in the columns of the table.
SQL Server supports four type of data integrity:
Entity Integrity
Entity Integrity can be enforced through indexes, UNIQUE constraints and PRIMARY KEY constraints.
Domain Integrity
Domain integrity validates data for a column of the table.
It can be enforced using:
Foreign key constraints,
Check constraints,
Default definitions
NOT NULL.
Referential Integrity
FOREIGN KEY and CHECK constraints are used to enforce Referential Integrity.
User-Defined Integrity
It enables you to create business logic which is not possible to develop using system constraints. You can use stored procedure, trigger and functions to create user-defined integrity.
Data Integrity validates the data before getting stored in the columns of the table.
SQL Server supports four type of data integrity:
Entity Integrity
Entity Integrity can be enforced through indexes, UNIQUE constraints and PRIMARY KEY constraints.
Domain Integrity
Domain integrity validates data for a column of the table.
It can be enforced using:
Foreign key constraints,
Check constraints,
Default definitions
NOT NULL.
Referential Integrity
FOREIGN KEY and CHECK constraints are used to enforce Referential Integrity.
User-Defined Integrity
It enables you to create business logic which is not possible to develop using system constraints. You can use stored procedure, trigger and functions to create user-defined integrity.
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