Write the queries in relational algebra, Database Management System

Assignment Help:

Problem:

You are given the following schema

1. Flights(flno, from, to, distance)
2. Aircraft(aid, flno, aname, cruisingRange)
3. Certified(eid, aid)
4. Employees(eid, ename, salary)

‘CruisingRange' is the distance that can be covered by an aircraft in a non-stop mode.

(i) Write the following queries in Relational Algebra.

(a) Find the names of pilots certified for 'Boeing 747' aircraft.

(b) Find the ids of all aircraft that can be used on non-stop flights from New York to Los Angeles.

(c) Find the names of pilots who can operate planes with a range greater than 3000 miles, but are not certified on 'Boeing 747' aircraft.

(ii) Write the following queries in SQL.

(a) Find the ids of employees who are not certified at all.

(b) Find the ids of all aircraft that can be used on non-stop flights from New York to Los Angeles.

Related Discussions:- Write the queries in relational algebra

Data fragmentation-use of partial data by applications, Use of partial data...

Use of partial data by applications : In common, applications work with views rather than whole relations. Thus, it may be more appropriate to work with subsets of relations rather

What is rdbms, What is RDBMS? Relational Data Base Management Systems (...

What is RDBMS? Relational Data Base Management Systems (RDBMS) are database management systems that maintain data records and indices in tables. Relationships may be formed and

Many-to-many relationship, For each m:n relationship type R, we make a new ...

For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att

Fragmentation, Differentiate between horizontal & mixed horizontal fragment...

Differentiate between horizontal & mixed horizontal fragmentation?

Explain the concept of a data model, Explain the concept of a data model ? ...

Explain the concept of a data model ? Data Model - Model is an abstraction procedure which hides irrelevant details although highlighting details relevant to the application

Define the wait for graph, Define the Wait for graph Ans: The wait-for-...

Define the Wait for graph Ans: The wait-for-graph is a directed graph and consist of nodes and directed arcs; the nodes of the graph are active transactions. An arc of the grap

Horizontal Fragmentation, I want to fragment existing table using java code...

I want to fragment existing table using java code... help me..!!

Limitations of dbms, what are the limitations of dbms?

what are the limitations of dbms?

Extended e-r features, Although, the essential features of E-R diagrams are...

Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need

Define the term- state, State The position of object at any moment is ...

State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages