Consider a database of King Abdulaziz Airport. For this mini-world example, define four mini-world entities and four mini-world relationships.
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- Consider a database that includes the entity sets student, course, and sectionfrom the university schema and that additionally records the marks that studentsreceive in different exams of different sections. Construct an alternative E-R diagram that uses only a binary relationship between student and section. Make sure that only one relationship exists between a particular student and section pair, yet you can represent the marks that a student gets in different exams.Consider a straightforward database that contains data about a student's grades. Provide a SQL query that will return a list of the honour roll students (the top 10%), ordered by their grade point average, and design how this database may appear.Draw the relationships and entities model for each of the following: * in the traditional way* for example: see the pic??. In the database of the library, the author can author more than one book, and the book can be subscribed toWritten by more than one author
- Consider a database table that includes a salary attribute. Suppose the three queries avg, count, and max (in that order) are made on the salary attribute, all conditioned on the same predicate involving other attributes. That is, a specific subset of records is selected and the three queries are performed on that subset. Suppose that the first two queries are answered and the third query is denied. Is any information leaked?Consider a database that belongs to an airline and employs snapshot isolation for its database management system. Describe an instance in which a nonserializable execution takes place, but the airline is open to the possibility that it will be prepared to tolerate it in exchange for improved overall performance.Consider, for instance, a airline's use of a database management system that includes snapshot isolation. To that end, I was hoping you could give me an illustration of a non-serializable execution that the airline is prepared to accept in exchange for enhanced performance.
- Give a relational database schema for the following: EMPLOYEE (Fname, Minit, Lname, SSN, Bdate, Address, Sex, Salary, Super_ssn, Dno) PK= Ssn FK= Super_ssn DEPARTMENT ( Dnamc, Dnumbcr, Mgr_ssn, Mgr_start_datc) PK= Dnumbcr FK= Dno DEPT_LOCATIONS (Dnumber, Dlocation) PK= Dnumber FK= Dnumbcr PROJECT (Pname, Pnumber, Plocation, Dnum) PK= Pnumber FK= Pno WORKS_ON (Essn, Pno, Hours) PK= Pno FK= ssn DEPENDENT (Essn, Dependent_name, Sex, Bdate, Relationship) PK= Essn FK= SsnConsider, for instance, the database used by a large airline that relies on snapshot isolation as the foundation for its data management. In order for an airline to be willing to accept a nonserializable execution in exchange for improved overall performance, what kinds of conditions would have to be met first?Consider, for instance, the database used by an airline, which implements snapshot isolation as part of its database management system. For instance, the airline could decide to go ahead and accept a nonserializable execution in order to get more favourable outcomes in the long term.
- Consider a bank's database system that utilises snapshot isolation. Describe a nonserializable execution that would present the bank with a challenge.Consider a database used to record the marks that students get in different exams ofdifferent course offerings (sections). Construct an E-R diagram that models exams as entities, anduses a ternary relationship, for the databaseConsider a database used to record the marks that students get in different exams of different course offerings. Construct an E-R diagram that models exams as entities, and uses a ternary relationship, for the above database.