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NEED FOR A DATABASE MANAGEMENT SYSTEM
A Database is a structured, persistent collection of data of an organisation. The database management system (DBMS) manages the database of an enterprise. But why do we need the database management system? To explain it, let us first discuss the alternative to it that is the file-based system.
Describe the advantage of State chart Diagram A state chart represents a state machine, emphasizing flow of control from one state to other. A state machine is a behaviour whi
Serialisability: Any schedule that makes the similar results as a serial schedule is known as a serialisable schedule. But how can a schedule are determined to be serialisable or n
Draw the database using the ER approach and then make the tables accordingly. Populate the tables so that every table have at least 10 tuples. Then using Java and SQL, execute the
How does the two phase protocol ensure serializability in database schedules? Ans: A transaction is termed to follow the two-phase locking protocol if all locking operations
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
tell me the functionality,advantages and disadvantages of student database
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
What are two special events? The two special events are as "entry" and "exit". Any action which is marked as linked to entry event is executed whenever given state is entered v
Express the subsequent query in SQL assumes which the data is stored within EMPLOYEE table with relevant fields (i) Display name, job, salary, and hire date of employee who are
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