By Laura C. Rivero, Jorge H. Doorn

One of many riding forces that inspired the emergence of database know-how was once the necessity to warrantly the standard of the knowledge saved. The software program layout is impacted through the homes of the information. information homes could be noticeable from some extent of view as independently as attainable from the illustration version. within the database international, caliber of knowledge signifies that all these houses are appropriately represented and preserved. effective upkeep of knowledge integrity has develop into a severe challenge when you consider that checking out the validity of a big variety of constraints in a wide database, after every one transaction is a pricey job. aimed at designers and execs drawn to the conceptual elements of integrity difficulties in numerous paradigms, Database Integrity: demanding situations and strategies effectively addresses those and numerous different concerns.

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Example text

In this case, the previous example turns into: CREATE TABLE PERSON ( DocumentType VARCHAR2(20) NOT NULL, DocumentNumber NUMBER NOT NULL, FirstName VARCHAR2(30) NOT NULL LastName VARCHAR2(30) NOT NULL Address ROW(Street varchar (20), Number integer, City varchar (20), State varchar (20), Zipcode integer) ); In Oracle, it is possible to create either an object type, a named varying array (VARRAY), a nested table type, or an incomplete object type using CREATE TYPE although this command is available only if the Oracle object option is installed on the database server.

Since the domain definitions and the table definitions are related, the alteration or dropping of a domain definition produces the propagation of this action over the related components. When RESTRICT is specified, the delete operation succeeds if, and only if, it is not referenced in any column definition in any table, view or integrity restriction definition. If CASCADE is specified, DROP DOMAIN always succeeds since all references from column tables, views or constraints will be dropped, too, and those column definitions will be altered with the DEFAULT value or the constraint definition if it corresponds.

The syntax is: CREATE DOMAIN domain-name [ AS ] data-type [DEFAULT default-option] [CHECK (search-condition)] Default-option and search-condition are detailed below. If the domain definition needs to be modified, the ALTER DOMAIN clause should be used; whenever a domain definition is no longer necessary, the proper sentence is DROP DOMAIN. ALTER DOMAIN DROP DOMAIN { RESTRICT | CASCADE } The domain-alteration-action may be the modification of the default value of a domain, the addition of a column-constraint-definition or the elimination of a constraint over that domain.

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