employee (ID, person_name, street, city) works (ID, compапy лате, salary) соmpany (comрапулате, сіty) manages (ID, manager_id) Figure 3.19 Employee database.
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Consider the employee
each of the following queries. Delete all tuples in the works relation for employees of “Small Bank Corporation”.
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- Computer Science Erd (Entity relation diagram) Make an ER diagram about an online scheduling program of appointments between doctors and patients - patients - doctors - appointments between doctors and patients - payments -reports files that users(doctors or patients) make it. and can be accessed by the adminDesign ER diagram to model the online bookstore’s database, in which there are four entities, namely books, authors, publishers, and customers entities. Every book has an author and a publisher. Customers can order books. Information about payment, shipping, and stock of goods does not need to be included in the model.SQL ER DIAGRAM DRAWING! Draw an ER diagram based on the simplified description given below (with diagrams.net for example) The restaurant's cash register system supports data transfer between the restaurant hall and the kitchen, collects information about ordered products for invoices, and keeps track of product delivery times. In its database, we want to store information about menu items, table invoices (table-specific invoices), orders and waiters. Each product on the menu has an identifier, name and price, and possibly one or more phrases describing the product (e.g. "lactose-free" or "vegan"). Both the product identifier and the name are unique. When the table party arrives at the restaurant and makes the first order, a table bill is opened on the table, where all the orders of the table are collected. The table bill has a unique identifier, the physical table number of the restaurant hall, the time the bill was opened, the total price and the time of payment. Each table…
- 2- Design a class diagram of a course registration system. Note: utilize various class relations: generalization, aggregation, composition, and association; the class diagram should include but not be limited 10 the following class names User, Student, Instructor, Admin, Course, LogonPage, AddPage, DropPage, ChangePage, PrintPage, QueryPage, CourselnfoDB, StudentinfoDB, InstructorinfoDB, AdminlnfoDB, and EntireDB.2- Design a class diagram of a course registration system. Note: utilize various class relations: generalization, aggregation, composition, and association; the class diagram should include but not be limited to the following class names User, Student, Instructor, Admin, Course, LogonPage, AddPage, DropPage, ChangePage, PrintPage, QueryPage, CoursenfoDB, StudentInfoDB, InstructorinfoDB, AdmintnfoDB, and EntireDB.A company database needs to store information about employees (identified by ssn, with salary and phone as attributes), departments (identified by dno, with dname and budget as attributes), and children of employees (with name and age as attributes). Employees work in departments; each department is managed by an employee; a child must be identified uniquely by name when the parent (who is an employee; assume that only one parent works for the company) is known. We are not interested in information about a child once the parent leaves the company. Draw an ER diagram that captures this information.
- A top-to-bottom relationship among the items in a database is established by aA new sales ordering system needs a relational database that contains a customer table, a product inventory table, and an order table. Use a word-processing, graphics, or spreadsheet program to draw an entity-relationship diagram showing the relationships among these entities. Next, design each of these tables showing the keys and attributes to be included in each table. Include five sample records for each table.A new sales ordering system needs a relational database that contains a customer table, a product inventory table, and an order table. Use a word-processing, graphics, or spread-sheet program to draw an entity-relationship diagram showing the relationships among these entities. Next, design each of these tables showing the keys and attributes to be included in each table. Include five sample records for each table.
- Differentiate between normalizing and standardizing. Explain your response by providing specific instances.Introduction to database: draw an ER Diagram that will be represented in the following information Properties are rented by tenants. Each tenant is assigned a unique number by the agency. Data held about each tenant includes family name, first name, contact address, phone number and property rented. A tenant may rent more than one property at any given time. Properties are owned by owners. Each property is assigned a unique building number. The agency only encourages a single owner for any of the properties it handles. The owner, address and value are recorded for each property. In addition, the lease period and bond, are recorded for each property rented. An owner may own several properties. Regular property maintenance is also recorded. The property, date, type of maintenance and cost are stored. Maintenance costs are charged to the property owner Tenants pay accounts to the agency for each property they rent. These consists of date of payment, tenant, property, type…Random Hospital Example ERD Problem Follow the Simple Procedure for ERD diagramming to design an ERD using the following user provided information. Remember the ERD will eventually turn into the design for a database from a top down view. Make sure you resolve any many to many conflicts. Label an identifier or primary key and all pertinent attributes given. If an attribute is not readily apparent from the user information, then make one up that makes sense for the particular entity. Therefore, all entities should end up with at least an identifier and another attribute that makes sense. You may use any of the approaches shown by the book, though the ER-Model and Crow’s foot are the most common. Make sure you show entities, relationships, cardinality, and optionality. Random Hospital Example A hospital has 10 wards, each containing up to 20 patients. Patients have only one doctor allowed to prescribe drugs for them. Doctors do their rounds once a day and prescribe drugs by…