What is the result of first performing the cross product of student and advisor, and then performing a selection operation on the result with the predicate s.id = ID? (Using the symbolic notation of relational algebra, this query can be written as sid=1D(student x advisor).)
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- What is the output of an operation that begins with the execution of a Cartesian product of student and adviser and then continues with a selection operation on the result using the predicate s id = ID? Using the symbolic notation of relational algebra, this query may be expressed as s id=ID if it is given in that format (student advisor).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).What happens after doing a selection operation with the predicate s id = ID on the result of a Cartesian product of student and advisor? This query may be represented by the symbol s id=ID when written in relational algebra (student advisor).
- a: Draw relational model b: Normalize upto 3NFModify the recursive query in Figure 5.16 to define a relationprereq_depth(course_id, prereq_id, depth) where the attribute depth indicates how many levels of intermediate prerequisites there are between the course and the prerequisite. Direct prerequisites havea depth of 0. Note that a prerequisite course may have multiple depths and thusmay appear more than once.Find the relation algebra query based on the SQL given.
- 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.Consider the query select A, B from rwhere r.B < some (select B from s where s.A = r.A)Show how to decorrelate this query using the multiset version of the semi join operation (Use a relational algebra expression).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 F
- For the given schema, write relational algebra for the following queries. Student (id, name) EnrolledIn (id, code) Subject (code, lecturer) 1. What are the names of students enrolled in cs3020? 2. Who teaches cs1500 or cs3020? 3. What are the names of students in cs1500 or cs3010? 4. What are the names of students in both cs1500 and cs1200? 5. Which subjects is Hector taking?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.TRUE OR FALSE In the Relational Data Model, Referential Integrity Constraint is a special kind/case of Foreign Key Constraint. Multiple Inheritance happens when a class has more than one sub-class. This problem can be observed in Programming Languages as well. Given two relations named A and B, if we q-JOIN A and B, the maximum number of attributes in the result relation could be (the number of attributes of A) times(*) the number of attributes of B). * in an SQL SELECT statement means “all the tuples”. In relational algebra, Cartesian Product (X) can be implemented using the q-JOIN operator. Cartesian Product ISA q-JOIN where q-condition always evaluates to true. SQL is based on Predicate Calculus. A query in SQL always specifies what should be included in the query result.
