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Describe in brief about the Sequence Diagrams
Sequence diagrams are interaction diagrams which emphasize time ordering of messages. In UML, it is shown as a table which shows objects arranged along the X axis and messages ordered in rising time along the Y axis. It has a global life line and focus of control. An object life line is vertical dashed line which represents existence of an object over a period of time. The focus of control is tall and thin rectangle which shows period during that an object is performing an action. The notation for depiction of sequence between objects with certain conditions is shown as:
Figure: Sequence diagram
give some example real-life situations where DBMS are most suiitabe
Class Diagram A class diagram is required to support functional necessity of system. In a static design view, class diagram is used to model vocabulary of the system, simple c
Do you have experts of the dbms
If R1 and R2 are two union compatible relations or functions, then the result of R3 = R1 ∩R2 is the relation that contains all tuples that are in both the relations In other words,
What is Multivalued Attribute? Multivalued Attribute - Multivalued attribute might have more than one value for an entity. For instance, PreviousDegrees of a STUDENT.
Question: Consider the following database relations for a textbook ordering system used by a college bookshop: Book (b-copy#, bname, ISBN#, author, price, subject) Order (s#
What is a Name? A user-supplied name is used for identity. This form of identity is used for files in file systems. The user gives every file a name that uniquely identifies it
What are the various symbols used to draw an E-R diagram (any 3)?
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Accessing information about permissions to all users- Object level permissions: With the use of data dictionary you can see the permissions to user. Let us get the table name fro
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