Maths Presentation Schedule

1.       Limit & Differentiation                        over

2.       Derivative                                          30 March

3.       Application of Derivative                    2 April

4.       Integration                                         4 April

5.       Application of Integration                   6 April

6.       Differential Equations                         9 April

IMP DBMS Information

1.       Problem with File System.

2.       Advantages & Disadvantages of DBMS.

3.       Function of DBMS.

4.       Relationship Types

5.       Hierarchical & Network Model

6.       Degree Data Abstract

7.       All kinds of Keys.

8.       Entity Rules

9.       Relation Set Operator

10.   Data Dictionary & Indexes

11.   ERModel & Normalization

12.   Cardinality, Weak Entity

o   DBMS                    -Database Management System

o   DBTG                     -Database Task Group

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Download Sem-2 Lecture Time-Table .EXE

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Assignment 4 (DBMS)

1.       What is weak entity? How you know that a particular entity is a weak entity explain with example.

2.       When do we call that two entities have a strong relationship?

3.       Explain domain of any attributes.

4.       Write a very short note on existence dependence.

5.       Explain relationship participation in detail.

6.       What is relationship degree ?Explain all kind of relationship degree why entity relationship is called recursive?

7.       Explain associative entities.

Weak Entity and Strong Entities in DBMS

An entity set that does not possess sufficient attributes to form a primary key is called a weak entity set. One that does have a primary key is called a strong entity set.

 For example,
The entity set transaction has attributes transaction-number, date and amount.
Different transactions on different accounts could share the same number.
These are not sufficient to form a primary key (uniquely identify a transaction).