What creates while a primary key is combined with a foreign, Database Management System

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What it creates while a primary key is combined with a foreign key?

It creates Parent-Child relation ship between the tables that connect them while a primary key is combined with a foreign key.

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One-way Associations When an association is traversed only in the one direction, then it is implemented as a pointer i.e.an attribute which contains an object reference. If mu

Mapping, external and internal mapping with examples

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Creating a view-data control, Creating a view: A query can be embed...

Creating a view: A query can be embedded within the CREATE VIEW STATEMENT A query can have complex select statements containing join, groups and sub- queries A quer

Fds in relationships and teaches relationship, FDs in Relationships: E...

FDs in Relationships: Enrols Relationship: None as it is many to many Teaches Relationship : Course code → Instructor Instructor → Course code The next question is:

Er schema, Consider entity type Employee with attributes empNumber (this is...

Consider entity type Employee with attributes empNumber (this is unique), empName, and the year when he/she was hired. An employee can either be a technical employee, a marketing e

Define the third normal form, Define the Third Normal Form: The third ...

Define the Third Normal Form: The third normal form (3NF) is a normal form employed in database normalization. 3NF was initially defined by E.F. Codd in 1971. Codd's definitio

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Have database built but having problems with some questions that go with the database

Explain the functional mode with help of an example, Explain the Functional...

Explain the Functional Mode with help of an example. Functional Model The functional model shows a computation and functional derivation of data values in it without ind

Example-revoke all on emp from mca12, Example: //REVOKE ALL ON EMP FROM MC...

Example: //REVOKE ALL ON EMP FROM MCA12; (All permissions will be cancelled) You can also cancel only some of the permissions. Drop: A user-

What is null, What is NULL? Simply NULL means not in value.

What is NULL? Simply NULL means not in value.

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