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What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appears
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
How external/conceptual mapping and conceptual /internal mapping is performed
Which of the operations constitute a basic set of operations for manipulating relational data? Relational algebra operations constitute a basic set of operations for manipulati
Heap files (unordered file) Mostly these files are unordered files. It is the easiest and most basic type. These files having of randomly ordered records. The records will have
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
What is an ER diagram? Why is it used in Database management system (DBMS)?
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
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