Multiple Inheritance happens when a class has more than one sub-class. This problem can be observed in Programming Languages as well.
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True or False :
___ Multiple Inheritance happens when a class has more than one sub-class. This problem can be observed in
___ Given two relations named A and B, if we q-JOIN A and B, the maximum number of attributes in the result relation could be (the number of attributes of A) times(*) the number of attributes of B).
____ * in an SQL SELECT statement means “all the tuples”.
____ In relational algebra, Cartesian Product (X) can be implemented using the q-JOIN operator. Cartesian Product ISA q-JOIN where q-condition always evaluates to true.
____ SQL is based on Predicate Calculus. A query in SQL always specifies what should be included in the query result.
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- TRUE OR FALSE In the Relational Data Model, Referential Integrity Constraint is a special kind/case of Foreign Key Constraint. Multiple Inheritance happens when a class has more than one sub-class. This problem can be observed in Programming Languages as well. Given two relations named A and B, if we q-JOIN A and B, the maximum number of attributes in the result relation could be (the number of attributes of A) times(*) the number of attributes of B). * in an SQL SELECT statement means “all the tuples”. In relational algebra, Cartesian Product (X) can be implemented using the q-JOIN operator. Cartesian Product ISA q-JOIN where q-condition always evaluates to true. SQL is based on Predicate Calculus. A query in SQL always specifies what should be included in the query result.When the Search button is pressed in the screen depicted, the getSales() function from the PosDAO.java class is called, the parameters of this function are the from date and to date.The getSales () function should return a list of Pos objects that matches the criteria specified, Note this function has to perform two INNER JOINs in to combine all three tables in order to get all the needed data to fill the Pos object. The database schema is also depicted. The PosDAO, Product, SalesDetails and Pos classes are shown BELOW Write the getSales() function public class PosDAO { private Connection conn; PreparedStatement stmt = null; public boolean openConnection(){ try { // db parameters String url = "jdbc:mysql://localhost:4306/swen2005"; String user = "root"; String password = ""; // create a connection to the database conn = DriverManager.getConnection(url, user, password); if (conn!= null){ return true;…Safe Datalog Rule: A Datalog rule is of the form:p :- q1, ..., qn. where n>0 and p is a positive atomic formula and q1, ..., and qn are positive or negative atomic formulas. A positive atomic formula is of the form:r(x1, ..., xm) and a negative atomic formulas of the form:not r(x1, ..., xm) where m>0 and r is a relation name and x1 , ..., xm are either numbers or variables. Relation names and variables are made up of alphabetic letters or digits and start with a lower-case alphabetic letter. Even though the variables are made up of lower and upper-case letters, these should be considered case-insensitive. For example, cno, CNO, cNO, etc all should be treated as the same variable. Some examples of Datalog rules are given below: ancestor(x1, y1) :- parent(x1, y1). teaches(tno,cno) :- faculty(tno), course(cno), assigned(tno,cno). p(x,y) :- q(2,x), r(u,45,z), s(a,b,22). p(x,y,z) :- q(x), not r(y,20), s(x,z). A Datalog rule is considered “Safe” if all variables that appear to the left…
- Design the database as a single relation called Movie. It should contain an ID, Title, Year Released, Genre (e.g., sci-fi, comedy, thriller, etc.), Rating (e.g., G, PG, R, etc.), Format (e.g., VHS, DVD, MP3, etc.), a free-form Comments field, plus the main cast and crew members. Add the following entry plus at least two of your own: Title: Star Trek Year: 2009 Genre: Sci-Fi Rating: PG Format: DVD Director: J. J. Abrams Starring: Chris Pine (Capt. Kirk), Zachary Quinto (Mr. Spock) Zoe Saldana (Uhura), Karl Urban (Bones McCoy) Draw your corrected design as a logical ERD showing attributes and multiplicities (suggest you use IE Notation in Oracle Data Modeler). No need to include physical data types. Modify the sample data from step 1 in a new page to match this designDesign the database as a single relation called Movie. It should contain an ID, Title, Year Released, Genre (e.g., sci-fi, comedy, thriller, etc.), Rating (e.g., G, PG, R, etc.), Format (e.g., VHS, DVD, MP3, etc.), a free-form Comments field, plus the main cast and crew members. Add the following entry plus at least two of your own: Title: Star Trek Year: 2009 Genre: Sci-Fi Rating: PG Format: DVD Director: J. J. Abrams Starring: Chris Pine (Capt. Kirk), Zachary Quinto (Mr. Spock) Zoe Saldana (Uhura), Karl Urban (Bones McCoy)Given the business rule "An employee may have many degrees." Suppose that an employee has the following degrees. BA, BS, MBA, etc. These degrees could be stored in a single string as a multivalued attribute name EMP_DEGREE in an EMPLOYEE table such as the one shown below: EMP_NUM EMP_LNAME EMP_DEGREE 123 Carter BA, BS, MBA 124 Smith BBA, MBA 125 Jones AS 126 Doe BS, MS, PhD. This design is flawed, so correct it by creating additional table(s) and attributes(s) and show the relationships between them. Show all the data above in your table(s). Add additional data if new attributes were added. Show primary and foreign keys in your table(s).
- The screen shown is used to enter the sales of the products into the sales and salesdetails tables. It utilizes the four depicted files ProductDAO.java, Product.java, PosDAO.java and Pos.java. The schema for the database is also depicted. The java code utilizes a jconnector to retrieve data from the database. When a product code is entered and then a quantity is entered, on the enter key pressed, the product code is sent to the getProduct(String ID) of a ProductDAO object and that function connects to the database and retrieves the data, placing it into a Product object and return this as Product object so that it can be placed into the Jtable of the PosGUI screen. Write the code for the getProduct(String ID) function located in the ProductDAO file. The code is equivalent to the prodid.One of the components of a composite primary key might be a candidate key. What would you do if you found out this?Design the database in an MS Excel spreadsheet as a single relation called Movie. It should contain an ID, Title, Year Released, Genre (e.g., sci-fi, comedy, thriller, etc.), Rating (e.g., G, PG, R, etc.), Format (e.g., VHS, DVD, MP3, etc.), a free-form Comments field, plus the main cast and crew members. Add the following entry plus at least two of your own: Title: Star Trek Year: 2009 Genre: Sci-Fi Rating: PG Format: DVD Director: J. J. Abrams Starring: Chris Pine (Capt. Kirk), Zachary Quinto (Mr. Spock) Zoe Saldana (Uhura), Karl Urban (Bones McCoy) What normal form is this design? Why? What should be done to correct the design?
- 115. The types of template dependencies are a. constraint generating templates b. tuple generating templates c. schema generating templates d. both a and bPrimary keys and candidate keys may both be assigned to the same attribute.QUESTION 1 SQL: Consider the following database schema for flight reservation database. A flight can be booked by many passengers, and a passenger can book different flights. For each booking, the date of the flight and price are recorded. The database schema is given below Flight (FID:int, Airline:string(unique), DepartingAirport:string, ArrivalAirport:string, Rating: int (1,2,3,4,5) ) Booking (FlightID: int, PassengerCPR: int, Date: date, Time: time, Price: double) Passenger (CPR:int, FirstName: String, LastName: String, Address:String) Write SQL Code to: Create the Flight Table.List the Departing Airport and Arrival Airport for all flights with rating 4 or 5.