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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.
What is Asterisk in SQL? Asterisk (*): In SQL, the columns for all the tables and views in the FROM clause will be displayed.
Create Relational Database Model (RDM) for Sailing bed and breakfast club Table_Name( attribute_1, attribute_2, attribute_3, ? ,attribute_x) Primary Key ( attribute_1, attribute_2)
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
What is meant by object-oriented data model? The object-oriented paradigm is based on encapsulation of data and code related to an object in to a one unit, whose contents are n
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
what should be included in this???
statical data
Explain the Recoverable Schedule A recoverable schedule is one in which for each pair of transactions Ti and Tj such that Tj reads a data item formerly written by Ti, the comm
Process of Adjustment of inheritance During object design, inheritance is readjusted by rearranging classes and operations, and abstracting common behaviour.
Which data type can store unstructured data? Raw data type can store unstructured data.
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