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- Let the database has two relations P(a, b) and Q(m, a, n) in which a is the primary key of the relation P and m is the primary key of the relation Q. Instance of P has 70 Tuples and Instance of Q has 42. What is the maximum number of rows in the new instance produced by P Q? ( is natural join)Consider the scenario below: A user creates a new relation r1 with a foreign key referencing another relation r2. What authorization privileges does the user need on r2 for effective operation? Why should this not be permitted without such authorization?Exercise 8.3 Consider a relation stored as a randomly ordered file for which the only index is an unclustered index on a field called sal. If you want to retrieve all records with sal > 20, is using the index always the best alternative? Explain.
- Create a website for collecting information during a vaccination camp conducted in an organization for COVID-19 using Node JS and Mongo DB. For each person in the vaccination camp collect, the employee id, name, department, government issued unique id. If the person is a dependent of the employee, record that information also. All the above details are stored in the database along with the date and time. During the course of the camp, the committee members from the organization may ask for the total count of employees' vaccinated, total count of dependents vaccinated. They may also ask to display the details of the employees vaccinated so far.Assume a relation 'R' having 200 records. These records are stored in blocks having block factor as 20. Consider another relation 'S' having 120 records and all these records are stored in 30 blocks. These two tables have to be joined using nested loop join algorithm. At any instance main memory can hold exactly one block of R and one block of S. What are the total number of block access required to join R and S ?Suppose a single relation (table) is used to record the information about students’ enrollment in courses. We assume that each student may enroll in more than one course and one course is assigned to one instructor. All questions below are based on the following ENROLLMENT unnormalized table. ENROLLMENT StudentID StuName CourseCode CourseName Grade CreditHr Instructor InstrOffice 1021234 Ali 1102 1201 Database Internet A B 3 3 Zaid Sumaiya 5.01 5.05 1024131 Amina 1201 1401 Internet Operating System C B 3 3 Sumaiya Abdullah 5.05 5.10 1. What would be the First Normal Form (1NF) relation? Identify the primary key. 2. Identify the functional dependencies represented by the attributes shown in the ENROLLMENT table. Label partial or transitive dependency where applicable.
- Use the following data model for this question:Fishfish_idnameDailyCatchcatch_iddateFish_Catchfish_catch_idcatch_idfish_idWhich of the following is a situation where an OUTER JOIN could be useful? When a fisherman wants to see only the fish that she has not caught When a fisherman wants to see all fish in the database including those that she has caught and those that she has not caught before When a fisherman wants to see only fish in the database that she has caught When a fisherman wants to see the fish that belong to a certain species4. _______ allow us to identify uniquely a tuple in the relation. a. Superkey b. Domain c. Attribute d. SchemaSuppose that the department relation DEPARTMENT (dnumber, dname, mgr_ssn, start_date) has 1000 record stored in 200 blocks. The DEPARTMENT has: a clustering index on dnumber with 4 levels with the number of blocks in the first level is 50. A hash index on dnumber with a hash function f(x)=x mod 10 A secondary index on dnumber with 4 levels with the number of blocks in the first level is 50. Analyze the cost that the optimizer will compute, and determine which cost is the most efficient: 1. o dno>5 (DEPARTMENT) 2. o dno=1 (DEPARTMENT)
- There are three tables in this database (see image). Write MYSQL code for: (1) Create a trigger “insert_inventory” on table “Inventory”. The trigger is fired after a row is inserted in table “Inventory”. After a row is inserted in table “inventory”, the “itemid”, the insertion time, and the action is inserted in table “Inventory_history”. The action is set to ‘add an item’. The oldprice is set to null. Test your trigger by inserting a row into Inventory and displaying the contents of Inventory_history. (2) Create a trigger “change_quantity” on table “Transaction”. The trigger is fired after a row is inserted in table “Transaction”. After a row is inserted in table “Transaction”, update the “quantity” in table “Inventory”. For example, if 3 iWatch are sold, then the quantity of iWatch in table “Inventory” is decreased by 3. Test your trigger by inserting a row into Transaction and displaying the contents of the relevant row in Inventory. (3) Create a trigger “change_price” on table…DATABASE SYSTEM A relation R is given which is R(A,B,C,D,E). It has the following functional dependencies: BC -> ADE , D -> B. Answer the following based on this information. Which normal forms does this relation satisfy? Which type of dependencies does this relation violate? Normalize the relationship so that it decomposes to 3NF.Any attributes that allow us to identify unique rows (tuples) in a given relation are known as super keys. Out of these super keys we can always choose a proper subset among these which can be used as a __?____key. Such keys are known as __?___keys. If there is a combination of two or more attributes which is being used as the primary key then we call it as a ______?__key.