How are attributes implemented?

The database used for this question is a very simple one with the following schema: (Primary keys are bold, foreign keys are underlined)   CUSTOMER (CustID, FirstName, LastName, City, Phone, Email) INVOICE (InvoiceNumber, CustID, Date) INVOICE_ITEM(InvoiceNumber, ItemNumber, Quantity) ITEM (ItemNumber, ItemName, UnitPrice)   When a customer makes a purchase, an invoice is created. The invoice may be for many items. For example, in a single purchase, a customer might buy 10 Back Scratchers, 4 Hair Removers and a Dog Lead. Provide relational algebra (NOT SQL) queries to find the following information. Each question is worth 2 marks. NOTE: You can use the symbolss, P, etc., or the words’ PROJECT’, ‘RESTRICT’etc.as you prefer. You do not need to try to make efficient queries – just correct ones. Where you use a join, always show the join condition.   List the first and last names of Customers who come from the City named Perth. List the first and last names of customers who had…

StayWell also rents out properties on a weekly basis to students attending summer school in the Seattle area. Design a database to meet the following requirements, using the shorthand representation and a diagram of your choice. For each student renter, list his or her number, first name, middle initial, last name, address, city, state, postal code, telephone number, and e-mail address. For each property, list the office number, property address, city, state, postal code, square footage, number of bedrooms, number of floors, maximum number of persons that can sleep in the unit, and the base weekly rate. For each rental agreement, list the renter number, first name, middle initial, last name, address, city, state, postal code, telephone number, start date of the rental, end date of the rental, and the weekly rental amount. The rental period is one or more weeks.

The database used for this question is a very simple one with the following schema: (Primary keys are bold, foreign keys are underlined)   CUSTOMER (CustID, FirstName, LastName, City, Phone, Email) INVOICE (InvoiceNumber, CustID, Date) INVOICE_ITEM(InvoiceNumber, ItemNumber, Quantity) ITEM (ItemNumber, ItemName, UnitPrice)   When a customer makes a purchase, an invoice is created. The invoice may be for many items. For example, in a single purchase, a customer might buy 10 Back Scratchers, 4 Hair Removers and a Dog Lead. Provide relational algebra (NOT SQL) queries to find the following information. NOTE: You can use the symbols  s, P, etc., or the words’ PROJECT’, ‘RESTRICT’ etc. as you prefer.  You do not need to try to make efficient queries – just correct ones. Where you use a join, always show the join condition.   List the dates on which Homer Griffin made purchases. List the first and last names of customers who have bought “Back Scratcher” or “Hair Remover” List the first…

E-R diagrams or DBDL may show database structure. Why do you prefer this method?

When constructing a database, the designer must know what types of relationships exist between records in different data sets, such as one- to-many or many-to-many. Give three examples for each of these relationships.

The restrictions of views' usage in terms of data security are explained, along with how views might be utilized as a component.

Your job as a database designer is to design a database with a schema that captures all the information that galleries need to maintain. Galleries keep information about artists, their names (which are unique), birthplaces, age, and style of art. For each piece of artwork, the artist, the year it was made, its unique title, its type of art (e.g., painting, photograph, sculpture), and its price must be stored. Pieces of artwork also classified into groups of various kinds, for example, portraits, still lives, works by Picasso, or works of the 19th century; a given piece may belong to more than one group. Each group is identified by a name (like those just given) that describes the group and property. Finally, galleries keep information about customers. For each customer, galleries keep that person’s unique ID, name, address, total amount of dollars spent in the gallery, and the artists and groups of art that the customer tends to like. Draw the ER diagram for the database.

What makes database programming unique? Which instances are you referring to?

What is metadata, exactly? For a result set, what is metadata? Result set information might be helpful in some situations.