Consider the relations Courses1. Courses2.Enrollment and Students.CorustAS IntLarvinnKary 144b) Courses1-Courses2(1) Give the results of the following relationalalgebra expressions:a) Tid (History OR Computing (Courses2))c) Courses Courses2FaralmentWHHEATHO ASHOBIHC ALAd) Courses Enrollmente)Enrollment/(Courses1)(2) Write the following query in Relational Algebra.a) Eind the sids of students who bave enrolled.incourse Calculusb) Find the names of students who have enrolled incourse Calculusc) Find the names of students who have enrolled atleast one course.d) Find the names of students who have enrolled inCalculus or Algebra.e) Find the sids of students who have enrolled in allcourses (both Courses1 and Courses2).

As per the answering guidelines solving the first 3 sub question completely. 1) Here selection…

Consider the relations Courses1.Courses Enrollment and Students. Location b) Courses1-Courses2 (1) Give the results of the following relational algebra expressions: a) Tid (e-History OR Computing (Courses2)) c) Courses In Courses2 Farst d) Courses Enrollment THE BE THE LAS HOA e) Enrollment/(Courses1) (2) Write the following query in Belational Algebra. a) Find the sids of students who bave enrolled in course. Calculus. b) Find the names of students who have enrolled in course Calculus. c) Find the names of students who have enrolled at least one course. d) Find the names of students who have enrolled in Calculus or Algebra. e) Find the sids of students who have enrolled in all courses (both Coursesland Courses2).

Consider the relations Courses1.Courses Enrollment and Students. Location b) Courses1-Courses2 (1) Give the results of the following relational algebra expressions: a) Tid (e-History OR Computing (Courses2)) c) Courses In Courses2 Farst d) Courses Enrollment THE BE THE LAS HOA e) Enrollment/(Courses1) (2) Write the following query in Belational Algebra. a) Find the sids of students who bave enrolled in course. Calculus. b) Find the names of students who have enrolled in course Calculus. c) Find the names of students who have enrolled at least one course. d) Find the names of students who have enrolled in Calculus or Algebra. e) Find the sids of students who have enrolled in all courses (both Coursesland Courses2).

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

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Given the following relational schema (Hint: the bold text represents a primary key), Department (dept_code, dept_name, emp_num, dept_address, dept_ext)Professor(emp_num, emp_fname, emp_lname, emp_dob, dept_code, prof_ext) Write a relation algebra to find all professor names (firstname and lastname) who are in the department named "Biology"
Consider a database that consists of the following relations.SUPpLIER(Sno. Sname)PART(Pno, Pname)PROJECT(Jno, Jname)SUPPLY(Sno, Pno, Jno)The database records information about suppliers, parts, and projectsandincludes a ternary relationship between suppliers, parts, and projects.Thisrelationship is a many-many-many relationships. Specify and execute thefollowingqueries using the relational algebraRetrieve the part numbers that are supplied to exactly two projects.b. Retrieve the names of suppliers who supply more than two parts toproject J11c. Retrieve the part numbers that are supplied by every supplier.d. Retrieve the project names that are supplied by supplier S1' only.e. Retrieve the names of suppliers who supply at least two different partseach to at least two different projects.
Please answer the remaining questions 4,5!! Please answer this DBMS ques asap! Suppose that we have three relations R1={A, B, C}, R2={A, B, D} and R3={B, C, D} under the relational data model. The relation R1 has 5 tuples, the relation R2 has 6 tuples and the relation R3 has 7 tuples. There are no NULL values in these relations. For each of the following relational algebra expressions, list the minimum and maximum numbers of tuples in the result that the relational algebra expression may have. (4) R1 ⋈ R2(5) ρX (R2) ⋈X.B≠Y.B ρY (R2) You can use the following format to organise your answers. (4) max=____ , min=____ ;(5) max=____ , min=____ ;
Defined the relational algebra operations as follows: SELECT (p, R) is equivalent to σp(R) referring to a set tuples of relation R that conforms to predicate p. PROJECT(L, R) is equivalent to πL(R) referring to a relation that contains a vertical subset of R, extracting the values of specified attributes L and eliminating duplicates. JOIN (R, p, S) refers to a relation containing a combination of tuples of relations R and S that satisfy the join condition p. FULL_JOIN (R, p, S) refers to a relation containing the result of outer join between relations R and S that satisfy the join condition p LEFT_JOIN (R, p, S) refers to a relation containing the result of left outer join between relations R and S that satisfy the join condition p RIGHT_JOIN (R, p, S) refers to a relation containing the result of right outer join between relations R and S that satisfy the join condition p CROSS (R, S) refers to a relation containing the catesian product of relations R and S. UNION (R, S)…
Defined the relational algebra operations as follows: SELECT (p, R) is equivalent to σp(R) referring to a set tuples of relation R that conforms to predicate p. PROJECT(L, R) is equivalent to πL(R) referring to a relation that contains a vertical subset of R, extracting the values of specified attributes L and eliminating duplicates. JOIN (R, p, S) refers to a relation containing a combination of tuples of relations R and S that satisfy the join condition p. FULL_JOIN (R, p, S) refers to a relation containing the result of outer join between relations R and S that satisfy the join condition p LEFT_JOIN (R, p, S) refers to a relation containing the result of left outer join between relations R and S that satisfy the join condition p RIGHT_JOIN (R, p, S) refers to a relation containing the result of right outer join between relations R and S that satisfy the join condition p CROSS (R, S) refers to a relation containing the catesian product of relations R and S. UNION (R, S)…
Q7. Consider a database containing two relations: R(A,B,C) and S(D,E,F). For each of three (your choice) of the 12 rewriting rules for relational algebra expression, give an example pair of relational algebra expressions involving R and S such that the rule rewrites one expression to the other expression, and give another example pair to show the rewriting rule cannot be used since some of the conditions for the rule are not satisfied.
Please help me in this problem of Relational databases: Consider the relation schema R = {A, B, C, D, E, F, G} and the following set Σ of FDs:• C → BG• AE → F• CF → EA• A → DF1. What are the candidate keys of R? Justify your answer (i.e., include the main steps used for findingthe candidate keys). 2. Find a minimal cover of Σ and include the main steps used for finding a minimal cover. 3. Demonstrate why R, given Σ, does not satisfy 3NF, and then identify a 3NF decomposition for R.You need to include the main steps used for identifying the 3NF decomposition
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.
Please answer this DBMS ques asap! Suppose that we have three relations R1={A, B, C}, R2={A, B, D} and R3={B, C, D} under the relational data model. The relation R1 has 5 tuples, the relation R2 has 6 tuples and the relation R3 has 7 tuples. There are no NULL values in these relations. For each of the following relational algebra expressions, list the minimum and maximum numbers of tuples in the result that the relational algebra expression may have. (1) πA,B(R1)(2) R2 × πB(R3)(3) πB(R2) ∪ πB(R3)(4) R1 ⋈ R2(5) ρX (R2) ⋈X.B≠Y.B ρY (R2) You can use the following format to organise your answers.(1) max=____ , min=____ ;(2) max=____ , min=____ ;(3) max=____ , min=____ ;(4) max=____ , min=____ ;(5) max=____ , min=____ ;
Given the following relational schema in the image attached. For the following query, prepare the initial (canonical) query tree, then show how the query tree is optimized by the use of heuristic optimization. (Provide all the relational algebra expressions for the query trees). ‘For every project located in ‘Stanford’, list the project number, the controlling department number, and the department manager’s lastname, address and birthdate’
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…
Consider the following relation for published books:BOOK (Book_title, Authorname, Book_type, Listprice, Author_affil, Publisher)Author_affil refers to the affiliation of the author. Suppose the following dependencies exist:Book_title → Publisher, Book_typeBook_type → ListpriceAuthor_name → Author-affil (a) What normal form is the relation in? Explain your answer.(b) Apply normalization until you cannot decompose the relations further. State the reasons behind eachdecomposition.

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