Time axis sd Database Access :Application getData() x = getData :Database processData(x) Interaction partners 1. Explain again about the concepts and how Sequence Diagrams work as above picture? 2. Use the work method that you described in answer Number 1 to identify objects interaction partners), interaction between objects, and message sequences on the system modeled in the diagram beside? 3. Explain whether Sequence Diagrams are suitable or generally used for any case?
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how to anwers below question based on Object Oriented Modeling/UML?
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- By given the following models and database context classes, answer the following questions or complete the missing codes: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel.DataAnnotations.Schema; using System.ComponentModel.DataAnnotations; namespace UniversityAssociationMvc.Models { public class Student { public int StudentID { get; set; } public string LastName { get; set; } public string FirstName { get; set; } public string Phone { get; set; } public string Email { get; set; } public DateTime RegistrationDate { get; set; } public virtual ICollection<Membership> Memberships { get; set; } } } using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel.DataAnnotations; namespace UniversityAssociationMvc.Models { public class Club { public int ClubID { get; set;…Draw the relationships and entities model for each of the following: * in the traditional way* for example: see the pic??. In the database of the library, the author can author more than one book, and the book can be subscribed toWritten by more than one authorIntegrate any programming language to mySQL with the implementation of Database Normalization and Creation of ER Model. What should I expect? 1. User login interface 2. An interface where I can input my details. (User registration form, Freshman Application Form, Credit Card Application Form, Bank Account Opening Form, and etc.) These are just samples, you can think of your own, of course. 3. From one whole big interface of registration form or any above-mentioned items, I should see the database normalization implemented from whole big table (1NF) to 3NF. The expectation is that the database should have 1NF table and lastly the 3NF tables.
- Today almost every commercial database is based on O the hierarchical model O the linked-list model O the object-oriented model lists the relational model Given the relations: STUDENT (SID. StudentName, Major, AdvisorID) ADVISOR (AdvisorID, AdvisorName, Office, Phone) such that each student is assigned to one advisor, which of the following is true? O Major is a candidate key. O Phone is a candidate key. AdvisorName is a determinant. O AdvisorID is a foreign key. O SID is both a primary key and a foreign key.Consider the following database scheme Employee (SSN, fname, lname, salary, deptno) Department (deptno, dname, total_salary) Where total salary is a derived attribute that represents the total salary of employees working in a specific department. Write a trigger to compute the total_salary in the event of inserting one or more new employee record(s) in the employee table.modern methods you would implement to harden your database environment.With clearly labelled diagram(s)
- Java database connectivity is established by using the DriverManager class. Identify its major drawback. Oracle provides an alternative - to use DataSource Interface. Assemble a list of advantages in a DataSource object over DriverManager class.Let us consider the following relational database. Students(stuID, lastName, firstName, major, gpa) Faculty(facID, name, deptName, rank) Classes(classNumber, facID, schedule, room) Enrolls(stuID, classNumber, grade) The column facID of relation Classes that references the table Faculty, The column StuID of relation Enrolls that references table Students, and The column classNunber of relation Enrolls that references table Classes. The following SQL statement is intended to add a record to the table Students. Assume that the entered value for each column is appropriate. In other words, there is no domain constraint violation. INSERT INTO Students(stuID, lastName, firstName, major) VALUES('950555111', 'Anna' 'Smith', 'BSIT'); However, this statement does not work correctly. Briefly explain why and list the correct SQL statement.Continuing with the Vince's Vinyl scenario from Hands-On Database, create an updated ERD after Normalization ? The diagram could pass the first three levels of normalization. There are a couple of issues, though, that could lead to further normalization: Customers and Sellers can be the same people. This could lead to update anomalies as the same person could have their information in two places. The solution is to create a Person entity that contains all names, phone numbers and email addresses. The person key could represent them in either role in Sale, Request, or Purchase. Another subtle issue relates to the entity Album. If Vince were to remove an album, and it was the only copy of that album, he would lose the album information. Also, there is potential redundancy in Album, since each physical vinyl is treated as an individual item in the table. Multiple copies of the same album would result in multiple entries identical except for purchase date and perhaps condition. To solve…
- Let us consider the following relational database. Students(stuID, lastName, firstName, major, gpa) Faculty(facID, name, deptName, rank) Classes(classNhmber, facID, schedule, room) Enrolls(stuID, classNumber, grade) The primary keys are underlined. The referential integrity constraints are as follows: The column facID of relation Classes that references table Faculty, The column of stuID of relation Enrolls that references table Students, and The column classNumber of relation Enrolls that references table Classes. The following SQL statement is intended to define the table Students. However, this statement does not work correctly. CREAT TABLE Students( lastName VARCHAR(20), firstName VARCHAR(20), major VARCHAR(40) gpa DECIMAL(3,2), PRIMARY KEY(stuID)); However, this statement does not work correctly. Briefly explain why and list the corrected SQL statement.I need help with the following Consider a STUDENT relation in a UNIVERSITY database with the followingattributes (Name, Ssn, Local_phone, Address, Cell_phone, Age, Gpa). Note thatthe cell phone may be from a different city and state (or province) from thelocal phone. A possible tuple of the relation is shown below:Name Ssn Local_phone Address Cell_phone Age GpaGeorge Shaw 123-45-6789 555-1234 123 Main St., 555-4321 19 3.75William Edwards Anytown, CA 94539a. Identify the critical missing information from the Local_phone andCell_phone attributes. (Hint: How do you call someone who lives in a dif ferent state or province?)b. Would you store this additional information in the Local_phone andCell_phone attributes or add new attributes to the schema for STUDENT?c. Consider the Name attribute. What are the advantages and disadvantagesof splitting this field from one attribute into three attributes (first name,middle name, and last name)?d. What general guideline would you recommend for…DATABASE SYSTEMS 16.Consider a relation R = (A,B,C,D,E) with the following functional dependencies: {C,E → D, D → B, C → A} and identify a candidate key. None of them {C,E,D} {C,E,B} {C,E} 17.A join in which tuples from R1 that do not have matching values in the common attributes of R2 are also included in the result relation. R1 left outer join R2 R1 semi join R R1 equi join R2 R1 natural join R2 18.When two transactions that access the same database items have their operations interleaved in a way that makes the values of some database items incorrect this problem is call? none of them dirty read summary problem the lost update problem 19.Protect the database from inconsistencies and data loss Database recovery Database Transaction & Concurrency control Concurrency control Concurrency control & Database recovery 20.Let E1 and E2 be two entity types in an entity relationship diagram. E1 have all three simple single-valued attributes while E2 have two simple…