Consider the following database scheme Employee (SSN, fname, Iname, 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.

Consider the following database scheme Employee (SSN, fname, Iname, 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.

Database Systems: Design, Implementation, & Management

11th Edition

ISBN:9781285196145

Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Chapter10: Transaction Management And Concurrency Control

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

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.
Suppose that you are a manufacturer of product ABC, which is composed of parts A, B, and C. Each time a new product ABC is created, it must be added to the product inventory, using the PROD_QOH in a table named PRODUCT. Also, each time the product is created, the parts inventory, using PART_QOH in a table named PART, must be reduced by one each of parts A, B, and C. The sample database contents are shown in Table P10.1. Given the preceding information, answer Questions a through e. How many database requests can you identify for an inventory update for both PRODUCT and PART? Using SQL, write each database request you identified in Step a. Write the complete transaction(s). Write the transaction log, using Table 10.1 as your template. Using the transaction log you created in Step d, trace its use in database recovery.
Suppose that you are a manufacturer of product ABC, which is composed of parts A, B, and C. Each time a new product ABC is created, it must be added to the product inventory, using the PROD_QOH in a table named PRODUCT. Also, each time the product is created, the parts inventory, using PART_QOH in a table named PART, must be reduced by one each of parts A, B, and C. The sample database contents are shown in Table P10.1.Given the preceding information, answer Questions a through e.a. How many database requests can you identify for an inventory update for both PRODUCT and PART?b. Using SQL, write each database request you identified in Step a.c. Write the complete transaction(s).d. Write the transaction log, using Table 10.1 as your template.e. Using the transaction log you created in Step d, trace its use in database recovery.
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…
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.
Consider a relational database for an online hotel booking company. The database consisting ofthe following tables (where the primary keys are underlined): Hotel (hId, hName, hAddress, hCity) Guest(gId, gName, gAddress, gCity) Room(hid, roomNo, type, price) Booking(gId, hId, roomNo, fromDate, year, noOfDays)Where hId and gId are identifiers for the hotels and the guests,and the Booking relation indicated that a guest booked a hotel room for a specified number of days(noOfDays) starting from fromDate of a given year. For instance, a tuple < g12345, h5555, 220,Jan05, 2016, 15> in Booking indicates that the guest g12345 booked room 220 of the h5555 hotelfor 8 days starting on Jan 5, 2016. The attribute "gAddress" records the home address of theguests.Write the following queries in relational algebra (1) Return thename of guests who have booked a hotel room in NYC in January 2016 (i.e.,fromDate between 01/01 and 01/31 and year=2016).(2) Return thename of guests who have booked a…
Give a relational database schema for the following: EMPLOYEE (Fname, Minit, Lname, SSN, Bdate, Address, Sex, Salary, Super_ssn, Dno) PK= Ssn FK= Super_ssn DEPARTMENT ( Dnamc, Dnumbcr, Mgr_ssn, Mgr_start_datc) PK= Dnumbcr FK= Dno DEPT_LOCATIONS (Dnumber, Dlocation) PK= Dnumber FK= Dnumbcr PROJECT (Pname, Pnumber, Plocation, Dnum) PK= Pnumber FK= Pno WORKS_ON (Essn, Pno, Hours) PK= Pno FK= ssn DEPENDENT (Essn, Dependent_name, Sex, Bdate, Relationship) PK= Essn FK= Ssn
Consider a scenario where two students are vying for registration in a course that has a limited capacity of one spot. What characteristic of a database system prevents both students from obtaining the last remaining seat?
Consider the Database schema on the relations Courses (Number, Faculty, Course Title, Tutor) Student (Number, Surname, First Name, Faculty) Tutors (Number, Surname, First Name) Exam (Student, Course, Grade, Date) Study Plan (Student, Course, Year) Formulate in relational algebra, in domain calculus, in tuple calculus and in Data log, the queries that produce: The student who have gained an ‘A’ in at least one exam, showing for each of them, the first name, sur name and the date of the first of such occasions; For every course in the engineering faculty, the student who passes the exam during last session; The students who pass all the exams required by their respective study plan For every course in the literature faculty, the student who pass the exam with the highest grade; The student whose study plans require them to attend lectures only in their own faculties; First name and sur name of the students who have taken an exam with a tutor having the same surname as the…
Given the following relation R and its functional dependencies: R(workerNumber, repairNumber, workerName, machineNumber, spentTime, repairDate, machineName, workshopNumber, workshopName ) workerNumber à workerName repairNumber à repairDate, machineNumber machineNumber à machineName, workshopNumber workshopNumber à workshopName 1)Create a database whose tables are at least in 3NF, showing the dependency diagrams for each table
QUESTION 2 Consider the database schema below: Company (CompnayID: integer, CompnayName: String (unique), address) Department (DepartmentID: Integer, DepartmentName: String, CompanyID: Integer) Employee (ID:integer; name:String, DepartmentID:intger (not null)) How many candidate key(s) in the Employee relation?
Given the following relation R and its functional dependencies: R(workerNumber, repairNumber, workerName, machineNumber, spentTime, repairDate, machineName, workshopNumber, workshopName ) workerNumber à workerName repairNumber à repairDate, machineNumber machineNumber à machineName, workshopNumber workshopNumber à workshopName Explain the types of all the dependencies in the relation R. Create a database whose tables are at least in 3NF, showing the dependency diagrams for each table.

SEE MORE QUESTIONS

Recommended textbooks for you

Database Systems: Design, Implementation, & Manag…

Computer Science

ISBN:

9781285196145

Author:

Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:

Cengage Learning