Consider the relations Courses1, Courses2,_Enrollmentand Students.Courses1Locationcid enameAl CalculusLIA2 Algebra L2A5 EnglishL3Student(sid, sname, age, level)Courses2cidA5BIB2nameEnglishHistoryb) Courses 1-Courses2L3L4Computing L5c) Courses Courses2Classroomd) Courses1 Enrollment(1) Give the results of the following relationalalgebra expressions:a) Teid ( name='History' OR 'Computing (Courses2))e) Enrollment / Teid (Courses1)EnrollmentcidAlA5sid101102103102102B1AlA2(2) Write the following query in Relational Algebra.a) Find the sids of students who have enrolled in_course Calculus.b) Find the names of students who have enrolled incourse Calculus._c) Find the names of students who have enrolled atleast 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 allcourses (both Courses1 and Courses2).

Consider the relations Courses1, Courses2, Enrollment and Students. Courses cid ename Location Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid A5 BI B2 Classroom L3 L4 Computing L5 b) Courses 1-Courses2 name English History (1) Give the results of the following relational algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) c) Courses Courses2 Enrollment sid cid 101 Al 102 A5 103 В1 102 Al 102 A2 d) Courses1 MEnrollment

Consider the relations Courses1, Courses2, Enrollment and Students. Courses cid ename Location Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid A5 BI B2 Classroom L3 L4 Computing L5 b) Courses 1-Courses2 name English History (1) Give the results of the following relational algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) c) Courses Courses2 Enrollment sid cid 101 Al 102 A5 103 В1 102 Al 102 A2 d) Courses1 MEnrollment

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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A relation FarmVisit is defined below with attributes in the table headings. FarmVisit visitorID visitorName date farmID farmName t1 H001 John 1 Feb 2021 A10 Green Field t2 Н005 Ashley 1 Jan 2021 A10 Green Field t3 но05 Ashley 1 Feb 2021 A10 Green Field t4 H005 Ashley 15 Apr 2021 H02 Есо t5 Но06 Ashley 15 Apr 2021 A11 Green Field a) Write down examples of tuples (i.e., tl, t2) to show neither of the following is a functional dependency: (i) visitorID -> date (ii) date -> farmID b) Write down the functional dependency (FDs) using the above data, which can represent all possible data. The FDs should be non-trivial and the determinants of the FDs should contain minimal number of attributes required. c) Using the tuples given, can (visitorID, farmID) be the primary key of FarmVisit? Explain why. d) What the highest normal form by which the FarmVisit relation can be classified? Explain why.
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PLS HELP ME : Write expressions of relational algebra to answer the following queries Find MaMH and TenMH of all courses having SOTIET greater than 45. Find MaSV, HoSV, TenSV of all students of the department Hệ thống thông tin. (denoted department name is TenMH) Find MaKH, TenKH of all departments having no students. (denotation of departments is MaKH, , student code is denoted by MaSV) 4. Find MaMH, TenMH of all courses learned by both Lê Kim Lan and Trần Minh Chánh. (the symbol of the courses is MAKH) 5. Find the MaSV, HoSV, TenSV of student having the highest scholarship. (the symbol for the scholarship is HOCBONG) 6. Find the MaSV, HoSV, TenSV of all students participating in at least two different courses. 7. Find the MaSV, HoSV, TenSV of all students participating in one course many times.
a) Complete the object conceptual data model for the following relational schema. Branch BranchID Location B001 Shatin ВО02 Homantin Order OrderID SalesTotal BranchID 0001 100 BO01 0002 200 BO02 0003 300 BO01 BranchID is the primary key of Branch table. OrderID is the primary key of Order table. BranchID in Order table is the foreign key references Branch table. Now, assume the OIDS are given below: Branch BranchID Location OID B001 Shatin OID1 B002 Homantin OID2 Order OrderID SalesTotal BranchID OID 0001 100 ВО01 OID3 0002 200 ВО02 OID4 0003 300 ВО01 OID5
Can someone help me with this? Please use relational algebra.
Consider the relations Courses1, Courses2, _Enrollment and Students. Courses cid cname Al Calculus A2 Algebra A5 English Location LI L2 L3 Student(sid, sname, age, level) Courses2 cid A5 Bl B2 name English History b) Courses 1-Courses2 L3 L4 Computing L5 (1) Give the results of the following relational algebra expressions: a) Teid ( name="History' OR 'Computing (Courses2)) c) Courses Courses2 Classroom d) Courses1 Enrollment e) Enrollment / Teid (Courses1) Enrollment sid cid 101 Al 102 A5 103 B1 102 102 Al A2 (2) Write the following query in Relational Algebra. a) Find the sids of students who have 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 Courses1 and Courses2).
1) Find names of those departments, each of which has at least two same-aged employees. 2)List names of those departments each of which has an employee named ‘Joe’. 3)List the names of employees, each of whom has salary more than the budget of the department he/she works in. Answer the above questions in relational algebra with reference to the following relational schema. Key fields are bold. Emp (eid:integer, ename:string, age:integer, salary:real)Works (eid:integer, did:integer, pct_time:integer)Dept (did:integer, dname:string, budget:real)
After executing a Cartesian product of student and advisor, followed by a selection operation on the result with the predicate s id = ID, what is the outcome of the operation? When stated in relational algebra's symbolic notation, this query may be represented as s id=ID(student advisor).
Why are the relationships mandatory to optional? Shouldn't they be mandatory to mandatory?
convert to relational algebra
explain the topic of Relational algebra Selection and Projection