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Consider the subsequent relations
RENTER(rno, fname, lname, address, tel_no, pref_type, max_rent) VIEWING(rno, pno, date, comment) PROPERTY_FOR_RENT( pno, street, area ,city, pcode, type, rooms, rent) Express the subsequent queries in relational algebra. (i) List the name and comments of all renters who have viewed a property. (ii) Identify all renters who have viewed all properties along with three rooms.
Ans: (i) Π fname,lname,comment(RENTER VIEWING) (ii) Π fname,lname ( σ rooms =3 (PROPERTY_FOR_RENT) RENTER VIEWING)
what is the relationship between receipt and owner entities in computer sales and service company
The Proliferation of Object-Oriented Methods The first few years of the 1990s saw blossoming of around fifty various object oriented methods. This proliferation is a sign of g
What is Relational calculus? Relational calculus is a Non- Procedural language.
Explain the main advantages of DBMS over File Oriented System ?
Define deadlock prevention. Deadlock prevention is a set of methods for ensuring that at least one of the four essential conditions like mutual exclusion, hold and wait, no pre
FDs in Relationships: Enrols Relationship: None as it is many to many Teaches Relationship : Course code → Instructor Instructor → Course code The next question is:
Design a database for an airline.The database must keep track of customers and their reservations,flights and their status, seat assignment on individual flights and, the schedule
Attributes and its types explain?
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
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