Write the appropriate SQL query for each of the following questions: Display the number of students acting in ‘Radio Club’ Display the sum of fees of activities organized by the IT club
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Write the appropriate SQL query for each of the following questions:
- Display the number of students acting in ‘Radio Club’
- Display the sum of fees of activities organized by the IT club
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- Consider an employee database with two relationsemployee (employee_name, street, city)works (employee_name, company_name, salary) where the primary keys are underlined. Write a function avg_salary that takes a company name as an argument and finds the average salary of employees at thatcompany. Then, write an SQL statement, using that function, to find companieswhose employees earn a higher salary, on average, than the average salary at“First Bank”.WRITE THE CODE OF MYSQL IN PYTHON Create database and tables as given below by using Python. (a) Market database (b) Vendor: vendor_id integer, vendor_name varchar, license_start date, license_end date (c) Item: item_id integer, item_name varchar, item_type varchar, previous_price float, last_sold_date date (d) Auction: auction_id integer, vendor_id integer, item_id integer, price float Choose primary and foreign keys depending on the relations in Market database design.Given the following relational database schema: Student = (SSN, Name, Major) Course = ( CourseNumber, PrerequisiteCourseNumber, Course Title, NumberUnits) Section = ( CourseNumber, Quarter, RoomNumber, DayTime), where DayTime is of the form MW 1:00-2:00PM. Enrollment = (SSN,CourseNumber, Quarter, Grade)// Grade is either Null or a letter grade. Express the following queries using appropriate SQL statements with a minimum number of operations: (a) List the name, SSN and number of courses the student has taken and completed, i.e. received a letter grade (courses with the same CourseNumber taken in different quarters are counted as different courses). (b) List the name, SSN and number of courses the student has taken and completed with a letter grade C or better (courses with the same CourseNumber taken in different quarters are counted as different courses). (c) List the Course Title and CourseNumber which does not have any prerequisite. (d) List the name of every student and SSN who…
- This question is related to the Database:- Suppose you are creating a database for a library management system. Explain how you would make a table for the "books" entity and insert some sample data, and then alter the table to add a new column for the "authorID" attribute and update "authorID" with some data. Finally, make a SQL query to retrieve all the books that were published after the year 2000. Note that this book schema has several columns, including "book_id" as the primary key, "title", "authorN", "publisher", "publication_year", "isbn", "language", and "num_pages". It also includes "available" column that is set to "true" by default and can be used to track the availability of the book. Please don't use handwriting...Suppose that we need to construct an SQLite database containing the below table of details of six pets. Id Name Animal Gender 1 Blue Dog Male 2 Luna Dog Female 3 Mena GuineaPig Female 4 Will GuineaPig Male 5 Ginger GuineaPig Male 6 Squeaks GuineaPig Female Write down the Python code to: • create the SQLite database; • create an appropriate table within the said database; • insert the data into the constructed table (an example suffices).Consider the following sales relational database schema for sales. Item (ItemNo: integer, ItemName:string, type:string) Customer (CID:integer, Cname:string, gender: character{ ’F’-Female, ‘M’-Male}) Sales (SalesID:integer, ItemNo:ineteger, CID:intger, price:double) Write the following queries in SQL. Display ItemName and type for all items bought by female customers. Display SalesID and ItemNo of the item with the lowest price.
- Let's wa(k through a review of basic SQL syntax, using as an example the database that was mentionedearlier. This database has the following simple structure(* indicates a primary key):Courses: CourseID*, CourseName, TeacherIDTeachers: TeacherID*, TeacherNameStudents; StudentID*, StudentNameStudentCourses: CourseID*, StudentID*Using the above table, implement the following queries.Query 1: Student Enrollment Query 2: Teacher Class SizeThis is my attempt at DBDL statements trying to plan a database in MySQL. Employers: CREATE TABLE Employers ( EmployerID INT PRIMARY KEY, CompanyName VARCHAR(255), Location VARCHAR(255), ContactInfo VARCHAR(255), ); Customers: CREATE TABLE Customers ( CustomerID INT PRIMARY KEY, Name VARCHAR(255), ContactInfo VARCHAR(255), Education VARCHAR(255), Experience INT ); Reference: CREATE TABLE References ( ReferenceID INT PRIMARY KEY, Name VARCHAR(255), ContactInfo VARCHAR(255), RelationshipToCustomer VARCHAR(255) ); Skills: CREATE TABLE Skills ( SkillID INT PRIMARY KEY, SkillName VARCHAR(255), ProficiencyLevel VARCHAR(255) ); EmploymentPositions: CREATE TABLE EmploymentPositions ( PositionID INT PRIMARY KEY, PostionTitle VARCHAR(255), EmployerID INT, Duration VARCHAR(255), FOREIGN KEY (EmployerID) REFERENCES Employers(EmployerID) ); Interviews: CREATE TABLE Interviews ( InterviewID INT PRIMARY KEY, InterviewDate DATE, Interviewer VARCHAR(255), Feedback VARCHAR(255) ); HiringStatus:…Define in SQL-like syntax a view of the engineering database V(ENO, ENAME, PNO, RESP), where the duration is 24. Is view V updatable? Assume that relations EMP and ASG are horizontally fragmented based on access frequencies as follows: Site 1 Site 2 Site 3 EMP1 EMP2 ASG1 ASG2 Where EMP1 = ?TITLE ≠“Engineer.”(EMP) EMP2 = ?TITLE =“Engineer.”(EMP) ASG1 = ?0 < DUR < 36(ASG) ASG2 = ?DUR ≥ 36(ASG) At which site(s) should the definition of V be stored without being fully replicated, to increase locality of reference?
- Which of the following database operations should be handled with extra care?The following query is written in relational algebra.Project[Deposit.aid,Deposit.amount](Select[Deposit.amount>=10000]( Join[aid=aid](Account,Deposit)))Our database system includes the implementation of B+ tree indexes solely. Assume wehave indexes on primary keys of tables and an index on Deposit.amount.Which join algorithm reads less number of pages from the disk: sort-merge join or indexnested loops join?Consider the following database in Prolog:birthday(tom).birthday(fred).birthday(helen),birthday(jack).happy(mary).happy(jane).happy(helen).happy(albert).attendparty(jane).attendparty(helen).hold_party(X): - birthday(X), happy(X) What would be the answer to the following query??- hold party(Who) a. Who = jane.b. Who = mary.c. Who = helen.d. All of the above.e. Who cannot be unified / instantiated.