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State the definition of association
An association is a structural relationship which specifies that objects of one thing are connected with objects of another. In UML, association is shown as a solid line connecting same or different class. The notation for association among nodes is shown as
Figure: Association between nodes
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
The issues relating to the Design of the Physical Database Files Physical File is a file as stored on the disk. The major issues relating to physical files are: • Cons
Multiple-mode locks : It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that neve
Timestamp Ordering Protocol A timestamp is a tag that can be attached to any transaction or any data item, which indicates a specific time on which the transaction or data item
Explain the ISA relationship Answer: ISA relationship - ISA notation is employed in generalization/ specialization to depict relationship among lower and higer level entity s
Define Aggregate functions and what aggregate functions supported by the MySQL To calculate a summary value from a set of individual values and uses one of the functions known
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
Draw an EER diagram that captures the "is-a" hierarchy of students in another simple database. The database captures both the "basic" information (say, student ID and student name)
Consider the relations given below Borrower (id_no, name) Book (accno., title, author, borrower_idno) (a) Define the above relations as tables in SQL forming real world assumptio
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