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- Consider the following SQL Query: SELECT FNAME, DNAME FROM EMP AS E, DEPT AS D WHERE E.DNO = D.DNUMBER AND D.DNAME='CCI' AND SALARY > 15000; Draw the initial query tree for the above SQL query, and then show how the query tree is optimized by applying the Heuristic Rules. (You need to show the tree after applying a rule).The query optimizer constructs an initial query tree using join, selection, and projection operations. (a) True (b) FalseQuestion 2: Create a database of a single list for 5 students in Prolog. A. Write a query to provide the following expectations: a. After the query is started, the student number to be given is taken, b. The final grade is calculated by using the midterm and final exam grades for all courses taken by this student, c. Student number, student name, course names, passing grades are written. B. Using the same database, write a query to satisfy the following expectations: a. After the query is started, the name of the course to be given is taken, b. The number, name and grade of the student who passes this course with the highest grade is printed.
- What does an EXCEPT (MINUS) query care about operand order, while a UNION query doesn't?Draw the initial query tree for this query, then show how the query tree is optimized (one rule at a time) and write the SQL query for the final optimized query tree.Question#1: Draw query tree for following relational queries. Also write SQL query for each relational query given. σsubject = "database"(Books) ∏ author (Books) ∪ ∏ author (Articles) σauthor = 'tutorialspoint'(Books Χ Articles) (πsName,p.pName,pa.Grade (σs.Age>25^pa.Grade=’A’ ((Student ⋈ Project_Allocation) ⋈ Project)))
- Specify the initial canonical query tree that corresponds to each query. 1) SELECT AVG(CUSTOMER.AGR) AS "AVG_AGE" FROM CUSTOMER; 2) SELECT * FROM VEHICLE WHERE V_BRAND LIKE 'L%'; 3) SELECT MEDIAN(VEHICLE.YEAR_OF_MADE) AS "MEDIAN_YEAR" FROM VEHICLE ;Supplier (sid, sname, city) Product (pid, pname, color) Catalog (sid, pid, price) (a): Write an SQL query for the following: Find names of products which have green color and are priced over $25. (b): Write an RA query which is equivalent to SQL query (equivalent to your answer in (a)). (c): Draw the query expression tree for your answer in (b)A. The relation R(a,b) may have duplicate tuples. Which of the following queries has a result that is guaranteed not to have duplicates, regardless of what tuples R contains? a) SELECT a, AVG(b) FROM R GROUP BY a b) SELECT b FROM R WHERE a = b c) SELECT a FROM R WHERE a >= ALL (SELECT a FROM R) d) SELECT a FROM R WHERE a = 1 B. Relation R(a,b) has no duplicate tuples, although neither a nor b is a key. Relation S(c,d) may have duplicates. Which of the following queries is guaranteed to produce no duplicates? a) SELECT c, d FROM S WHERE c IN (SELECT a FROM R) AND d IN (SELECT b FROM R) b) SELECT S.c, S.d FROM R, S WHERE R.a = S.d AND R.b = S.c c) SELECT c FROM S WHERE c = d d) SELECT c, d FROM S GROUP BY c, d
- Optimize the following SQL Query by using Query Tree and Heuristic Rules: SELECT C.Fname, E.Fname FROM Employee AS E, Customer AS C, Order AS O WHERE E.EMP_ID=O.E_ID AND C.City=’Jeddah’ AND C.Customer_ID=O.C_ID AND E.EMP_ID=’12943’ You should show the Initial Query Tree and add a screenshot of the Query Tree after applying each rule.For the following query:Map it to a query treeProvide a simplified WHERE clauseMap a query with simplified WHERE clause in the above 2) to a query treeSELECT ENAME, PNAMEFROM EMP, ASG, PROJWHERE (DUR > 12 OR RESP = "Analyst") ANDEMP.ENO = ASG.ENO AND(TITLE = "Elect. Eng."OR ASG.PNO < "P3") AND(DUR > 12 OR RESP NOT= "Analyst") ANDASG.PNO = PROJ.PNOOptimize the following SQL Query by using Query Tree and Heuristic Rules: SELECT C.Fname, E.Fname FROM Employee AS E, Customer AS C, Order AS O WHERE E.EMP_ID=0.E_ID AND C.City='Jeddah' AND C.Customer_ID=0.C_ID AND E.EMP_ID='12943' You should show the Initial Query Tree and add a screenshot of the Query Tree after applying each rule. Please do not give me answer from chat gpt or any Ai , the screenshot should be from draw io for example