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Create an ER diagram for each of the following descriptions:
(a) Each company operates four departments, and each department belongs to one company.
(b) Each department in part (a) employs one or more employees, and each employee works for one department.
(c) Each of the employees in part (b) may or may not have one or more dependants, and each dependant belongs to one employee.
(d) Each employee in part (c) may or may not have an employment history.
(e) Represent all the ER diagrams described in (a), (b), (c), and (d) as a single ER diagram.
Summarize your paper by describing the database systems in your workplace, identifying which database systems and architecture they fall under.
You have probably seen that already when you tried to create an E-R diagram. Visio uses notation and graphical shapes that are not the same as those in your text. If you look at some of the links to schemas, you will see a similar sort of thing.
To lock any other vertex, the transaction must have visited all the parents of that vertex and must be having a lock on one of the parents of the vertex. Show that the protocol ensures serializability and deadlock freedom.
Write a SELECT statement that answers this problem - Which products have a list price that's greater than the average list price for all products?
Assignment: Research organizational benefits of using databases and DBMS's. Supplement your research with a review of your lessons. Post a response to the discussion board: Respond to the following statements and, if appropriate, include personal e..
Process the weather data for Auckland and Invercargill in the given dataset (monthly readings) and-focusing in particular on temperature related data-experiment with various data mining techniques
What would be the total overhead cost per customer according to the activity based costing system? In other words, what would be the overall activity rate for the customer support activity cost pool?
Draw the corresponding GRD, exhibiting all the primary keys and foreign keys. For simplicity, no other attributes nor multiplicity constraints are required.
Identify and describe three limitations of the relational model and recommend strategies to overcome these limitations.
Create a database diagram with the entities and attributes that the scenario identified (i.e., a college tracking students, courses, and instructors).
Why would you choose a database system instead of simply storing data in operating system files? When would it make sense not to use a database system?
Principles of database design, as demonstrated by the database design for project - Designing and creating the following basic (master) tables for the application and "Employee" table, to hold the details of employees
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