Consider the following expressions, which use the result of a relational algebra operation as the input to another operation. For each expression, explain in words what the expression does. a. year 2009 (takes) ▷ student b. year 2009 (takes student) C. ID.name, course_id (student takes)
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- For each of the following pairs of expressions, give instances of relations thatshow the expressions are not equivalent. ΠA(r − s) and ΠA(r) − ΠA(s).2) Write SQL query that returns the Name of ALL employees (based on EMP_LNAME and EMP_FNAME in EMPLOYEE table, call this EMP_NAME), Gender of ALL employees (based on EMP_TITLE in EMPLOYEE table, call this EMP_NAME), and Pilot ratings if any (PIL_RATINGS in PILOT table). Output: EMP_NAME EMP_GENDER Rhett VanDam M John Lange M Jeanine Duzak FWhich of the following can be the output of an operation in relational algebra?(a) An attribute(b) A relation(c) An expression(d) All of the above
- Exercise 3: Procedural SQLWrite the following PSM functions or proceduresa) Take a price as argument and return the model number of the PC whose price isclosest.b) Take a maker and model as arguments, and return the price of whatever type ofproduct that model is.Write expressions of relational algebra to answer the following queries:. a) Write an SQL query to find the manufacturer and model for all aircraft models with capacity at least 300. b) write a relational algebra expression which is equivalent to the above query. c) Write an SQL query to find the names of the airlines that have at least 10 Boeing 737 in their fleet. d) What is the result of the natural join of the following two tables: Airlines and Fleet
- Design the SQL-statements that are used as a basis tocreate the original reports and other queries that includethe following (at least):- A SELECT using an inequality- A SELECT using LIKE on a text field- A SELECT on a DATE column- A query using GROUP BY- A query using HAVING- A query using ORDER BY- A query using a subquery- A query using a correlated subquery- A query involving COUNT(*)- A query involving another aggregate function - A selective DELETE- A selective UPDATEWrite SQL statements for following:Student( Enrno, name, courseId, emailId, cellno)Course(courseId, course_nm, duration)i) Add a column city in student table.ii) Find out list of students who have enrolled in “computer” course.iii) List name of all courses with their duration.iv) List name of all students start with „a‟.v) List email Id and cell no of all mechanical engineering studentsThe following normal form preserves all functional dependencies A. 4NF B. 3NF C. BCNF D. 2NF
- In the SQL Oracle Application Write one query to return the employee_id, job_id, hire_date, and department_id of all employees and a second query listing employee_id, job_id, start_date, and department_id from the job_history table and combine the results as one single output. Make sure you suppress duplicates in the output.a: Draw relational model b: Normalize upto 3NFRepeat Exercise 4, but this time use the EXISTS operator in your query.