DbmsEnotes

SPECIAL RELATIONAL OPERATIONS These includes operations like   Selection Projection Join Division 1. Selection- To identify a...

RELATIONAL CALCULUS Relational algebra is concerned with a procedural language in which the user has to write the steps or procedure to...

INTEGRITY CONSTRAINTS OVER RELATION INTRODUCTION Database integrity refers to the validity and consistency of stored data. Integrit...

ER TO RELATIONAL MODEL CONVERSION INTRODUCTION - In the E-R model, data is represented using entities, and relationships are defined...

KEY CONSTRAINTS INTRODUCTION- A   Key Constraint   is a statement that a certain   minimal  subset of the fields of a relation is a uni...