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Draw E-R diagrams demonstrating each of the following relationships (create three meaningful examples for each relationship): One-to-One, One-to-many, One-to-Optional Many, Optional Many-to-One, Optional Many-to-Optional Many. Show the relationships horizontally.
For each E-R diagram, state the relationship in words (for both, the forward path and the backward path).
A. Each employee is assigned to one and only one office. Each office is occupied by one and only one employee.B. Each cargo aircraft will serve from one to many distribution centers. Each distribution center is served by one and only one cargo aircraft.C. One systems analyst is assigned to anywhere from zero to many projects. Each project will be developed by one and only one systems analyst.D. One machine is undergoing anywhere from zero to one scheduled maintenance. Scheduled maintenance is being done to one and only one machine.E. Each salesperson is assigned to anywhere from one to many customers. Each customer may have from one to many salespersons.F. One home office has one to many employees. Each employee may be assigned from zero to one home office.G. Each passenger is flying to many destinations. Each destination will be visited by many passengers.
VSS has an existing software package that controls its high bay systems and wants to rewrite it. The existing system is written in C and uses C-ISAM files to store data.
Transform the tables into one or more tables in BCNF. State the primary keys, candidate keys, and referential integrity constraints.
These are normalization procedures suggested by Shome and Cornell. EQ Tools program permits any of these normalization (or scaling) approaches.
ISYS 224 Database Systems - Relational Database Design & Implementation
Prove that the algorithm for decomposing a relation schema with a set of FDs into a collection of BCNF relation schemas as described in Section 19.6.1 is correct (i.e., it produces a collection of BCNF relations, and is lossless-join) and terminates.
suppose we have a relation employees ssn name department salary.nbspfor each of the following queries either write the
query 1 write a sql statement to display students first and last name. query 2 write a sql statement to display the
Explain the use of facts, dimensions and attributes in a star schema model. Explain the use of facts, dimensions and attributes in a star schema model.
What about giving same name to attributes which are in different tables but are not same? For instance, "Description" in both a Course table and a Classroom table.
Create a state transition diagram that describes typical student states and how they change based on specific actions and events.
Explain Class diagram. Outline the main steps in developing a class diagram for a Use Case(UC).
Draw the E/R diagrams for the business rules
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