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What is key?          A key is a set of one or more columns whose combine values are unique among all occurrences in a give…

What is attribute?                       It is a properties of an entity type. Is entity with normally have one or more a…

What is entity?              An entity is an object with a physical existence or it may be conceptual, so every organisat…

Explain the architecture of DBMS or three schema architecture?                In this architecture schema can we define at the…

Data Independence:                                          The ability to modify the conceptual schema without having chang…

What is schema ?                The logical structure of the database is called schema.               Schema may be categor…

WHAT IS DATA?                     Data is a collection of raw facts. WHAT IS DATA BASE?                   A database …