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Many-to-many: Entities in A and B are related with any number of entities from each other.
Example:
Taught_by Relationship among course and faculty.
One faculty member can be assigned to teach a lot of courses and one course may be taught by a lot of faculty members.
Relationship among book and author.
One author can explained a lot of books and one book can be written by more than one authors.
More about Relationships and Entities
Explain what is DDL? DDL - Data Definition Language: statements used to define the database structure or schema. Some examples: CREATE - to create objects in the database ALT
what are the type of the database
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Vertical Fragmentation- Vertical fragmentation groups together only those attributes in a relation that are used jointly by various important transactions. A vertical fragment is d
Illustrate the collaboration and relationship diagram A collaboration is the society of interfaces, classes and other elements which work together to provide some cooperative b
Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.
Q. What is relational algebra and calculus? Explain the relational algebra operators :- Selection and predicate, set operation, joins and division. Sol. Relational Algebra
State the Design of Associations Before designing associations, it is essential to know the way they are used. For this, analysis of association traversals is required. It is
Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
10A.53 Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department. 10A.54 Code an Oracle Database trigger to allow the
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