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In the first unit of this block, you have been given with the details of the Database Management System, its structure, advantages etc. This unit is an attempt to give you information about E-R models and relational. The relational model is a widely used model for DBMS execution. Most of the commercial DBMS products available in the industry are relational at core. In this part we will talk about the operators, terminology and operations used in relational model.
The second model discussed in this section is the E-R model, which mostly is a semantic model and is very essential in creating raw database design that can be further normalised. We talk about DBMS E-R diagrams, and their conversion to tables in this part.
After Reading this unit, you should be able to:
• Explain relational model and its advantages;
• Execute basic operations using relational algebra;
• Illustrate an E-R diagram for a given problem;
• Change an E-R diagram to a relational database and vice versa.
Data Redundancy -A lot of information is being repeated in the relation. For instance, the information that MCS-014 is named SSAD is repetitive, address of Rahul is "D- 27, Main ro
what is database management system? & why it is required?
Guidelines for creation of table: Table name should begin with an alphabet. In table name, single quotes and blank spaces are not allowed. Reserve words of that DBM
What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm
Question: One of the tasks a database management system must perform is to ensure that the data is still intact in the face of software and hardware failure. This task is known
Consider the 1ollowin8 relation: CAR SALE (Car_id, Option_type, Option_listprice, Sale_date, Option_discountedprice) This relation refers to options installed in cars (e.g., crui
What are the different approaches for database design? There are two basic approaches for database design which are as follows: Attribute driven: It compiles a list of att
what is the need of a log in dbms
What are the advantages and disadvantages of merging an association into a class? Advantages: i) Less number of tables ii) Faster performance due to the fewer tables
First Normal Form and second normal form First Normal Form (1NF) A relation is said to be in 1NF if it having no non-atomic values and each row can give a unique combinat
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