A set or collection of one or more attributes or fields (column), which uniquely identify a row or tuple in a relation or table is known as super key.
All the minimal super key with no redundant attributes is known as candidate key. candidate keys are the subset of super keys.
In a relation or table can have more than one choice of primary key, but only one of them set as a primary key. All the others keys which are able to declar ...
A non-key attribute, whose values are derived from the primary key of another table, is known as foreign key.
Sometimes more than one attribute needs to create a key that uniquely represents a tuple. That keys are known as a composite key or compound key.
We can create tables to store data using CREATE TABLE Statement in any RDBMS. This Statement is differ in different RDBMS.
The full form of SQL is Structured Query Language. It is a language which handles the database, Specially RDBMS (Relational Database Management System)