In hierarchical model, data is organized into a tree like structure with each record is having one parent record and many children. The main drawback… [Read More]

In relational model, the data and relationships are represented by collection of inter-related tables. Each table is a group of column and rows, where column… [Read More]

An Entity–relationship model (ER model) describes the structure of a database with the help of a diagram, which is known as Entity Relationship Diagram (ER… [Read More]

Key plays an important role in relational database; it is used for identifying unique rows from table. It also establishes relationship among tables. Types of… [Read More]

As we have seen in the candidate key guide that a table can have multiple candidate keys. Among these candidate keys, only one key gets… [Read More]

Definition of Composite key: A key that has more than one attributes is known as composite key. It is also known as compound key. Note:… [Read More]

Definition of Candidate Key in DBMS: A super key with no redundant attribute is known as candidate key. Candidate keys are selected from the set… [Read More]

Definition: Foreign keys are the columns of a table that points to the primary key of another table. They act as a cross-reference between tables…. [Read More]

Definition of Super Key in DBMS: A super key is a set of one or more attributes (columns), which can uniquely identify a row in… [Read More]

In this guide, you will learn about primary key in DBMS with the help of examples. We will discuss, what is a primary key, how… [Read More]