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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
Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
CAN SOMEONE HELP ME WITH ENTITY DIAGRAMS IN FIRST NORMAL FORM?
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
Multiple-mode locks : It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that neve
What is Identity? Identity (or AutoNumber) is a column that automatically produces numeric values. A start and increment value can be set, but most DBA leave these at 1. A GUID
Representing complex relationship among data A database may contain varieties of data interrelated to each other in numerous ways. A DBMS must have the capability to represent
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
Explain CNT in the respects of QBE ? CNT: It is one of the aggregation commands given in QBE. It is used to identify number of tuples
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