Consider the relations Courses1. Courses2. Enrollment and Students B Hary L (1) Give the results of the following relational algebra expressions: a) Tit (- Hay O Computing (Courses2)) b) Coursesl-Courses2 AB HC Ties THE HE AL c) Courses Courses2 d) Courses Enrollment
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- PLZ help with the following: IN SQL Let R (A, B, C) be a relation schema. What happens if we execute the following query? SELECT* FROM R WHERE A=D; Select one: a. We get an error. b. The query executes successfully but returns no tuples. c. The query returns all the tuples in R.Consider the relations Courses1. Courses2. Enrollment and Students. Corust AS Int Larvinn Kary 144 b) Courses1-Courses2 (1) Give the results of the following relational algebra expressions: a) Tid (History OR Computing (Courses2)) c) Courses Courses2 Faralment WH HEAT HO AS HOBI HC AL A d) Courses Enrollment e) Enrollment/(Courses1) (2) Write the following query in Relational Algebra. a) Eind 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 Courses1 and Courses2).Consider the relations Courses1, Courses2, _Enrollment and Students. Courses cid ename Al Calculus A2 Algebra A5 English Location LI L2 L3 Student(sid, sname, age, level) Courses2 cid AS B1 B2 name English History b) Courses 1-Courses2 L3 L4 Computing L5 c) Courses Courses2 Classroom (1) Give the results of the following relational _algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) d) Courses1 Enrollment e) Enrollment / Teid (Courses1) Enrollment sid cid 101 Al 102 A5 103 Bl 102 Al 102 A2 CARENA (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).
- Consider the relational schema for a library system as given below: Member (mem_no, name, dob) Books (isbn, title, authors, publisher) Borrowed (mem_no, isbn, date) Write the following queries in relational algebra. i. List the members who have not borrowed any books from the library. ii. Name all the books borrowed by a member named 'Ram'. ii. List the book that has been borrowed the most.Consider the relations Courses1, Courses2, _Enrollment and Students. Courses1 Location cid cname Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid A5 BI B2 name English History b) Courses 1-Courses2 L3 L4 Computing L5 c) Courses Courses2 Classroom d) Courses1 Enrollment (1) Give the results of the following relational algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) e) Enrollment / Teid (Courses1) Enrollment cid Al A5 sid 101 102 103 102 102 B1 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).The aim of assignment 1 is to implement a database schema and execute different types of SQL queries in Oracle SQL developer. Given the following relational schema: Student (studid, FirstName, LastName, Email, phoneNumber, DateofBirth, GPA) Club (clubid, ClubName, #studid) MemberOf (#clubid, #studid, joiningDate ) Activities (actid, actdt, place, durationNbHour) Organize (#actid , #clubid , fee) 1. Write SQL queries to create the following tables according to the below descriptions. Table name: Student studid |Char(9) Primary key FirstName Varchar2(50) NOT NULL LastName Varchar2(50) NOT NULL Email Varchar2(50) NOT NULL, UNIQUE phoneNumber Number(8) NOT NULL, UNIQUE DateofBirth Date NOT NULL GPA Number(1,2) NOT NULL Table name: Club clubID Number(3) Primary key ClubName Varchar2(20)NOT NULL NULL, UNIQUE, NOT Foreign key studid Char(9) Table Name: MemberOf ClubID Number(3) Primary Key, Foreign Key Studid Char(9) Primary Key, Foreign Key joiningDate Date Table Name: Activities Actid…
- Consider the relational schema below: Students(sid: integer, sname: string, major: string) Courses(cid: string, cname: string) Enrollment(sid: integer, cid: string, grade: real) Write a tuple relational calculus expression that satisfies this query? Find the distinct names of all students who major in either "Math" or "Economics" who score less than 60% in either course 91.574 or in course 14.501 (using cid). Submit your answer as one or more LaTeX expression in the answer field below. View keyboard shortcutsConsider 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).B2. Consider the following SQL query in the STUDENT relation.SELECT SNO FROM STUDENTWHERE (CR_HOURS > 12 OR MAJOR != “DATABASE”)AND DNAME = “IT”AND (MAJOR = “DATABASE” OR CR_HOURS > 12); a. Simplify the query using idempotency rules b. Draw the relational algebra tree for the above-simplified query.
- Write the following queries, based on the database schema Product(maker, model, type)PC(model, speed, ram, hd, price)Laptop(model, speed, ram, hd, screen, price)Printer(model, color, type, price) of Exercise 2.4.1. You should use at least one subquery in each of your answersand write each query in two significantly different ways (e.g., using differentsets of the operators EXISTS, IN, ALL, and ANY). a) Find the makers of PC's with a speed of at least 3.0.b) Find the printers with the highest price.! c) Find the laptops whose speed is slower than that of any PC.! d) Find the model number of the item (PC, laptop, or printer) with thehighest price.! e) Find the maker of the color printer with the lowest price.!! f) Find the maker(s) of the PC(s) with the fastest processor among all thosePC's that have the smallest amount of RAM.Three relational schemas are given below. Patient (patientID, name, address, age) Doctor (doctorID, name, specialty, yearsExperience) Diagnosis (diagnosisID. patientID, doctorlD, diagnosisName, prescription) NOTE: Express each of the provided information needs as a relational algebra query using only projection (n), selection (a), renaming (p), inner joins (), set union/intersection (U, n), and division (). You may write your queries using either the symbol (i.e. n) using the 'Insert Math Equation' option or the operations' word terminology (i.e. projection). (1) Find the ID's of patients who have been diagnosed by a doctor with more than 15 years and less than 10 years experience. (2) Find the prescriptions given by doctors with a "cardiologist" specialty.QUESTION 3 a) Discuss in detail the SELECT, PROJECT and UNION operators with suitable examples in relational algebra.