Execute sql queries, Database Management System

Assignment Help:

Consider the relations described below:
PHYSICIAN (regno, name, telno, city)
PATIENT (pname, street, city)
VISIT (pname, regno, date_of_visit, fee)
Where the regno and pname identify the physician and the patient uniquely corresponding. Express queries (i) to (iii) in SQL.
(i) Get the name and regno of physicians who are in Delhi.
(ii) Find out the name and city of patient(s) who visited a physician on 31 August 2004.
(iii) Get the name of the physician and the total number of patients who have visited her.
(iv) What does the subsequent SQL query answer
SELECT DISTINCT name
FROM PHYSICIAN P
WHERE NOT EXISTS
( SELECT *
FROM VISIT
WHERE regno = p.regno )

(i) Select name, regno from PHYSICIAN where city = ‘Delhi';
(ii) Select pname, city from PATIENT,VISIT where PATIENT.pname=VISIT.pname and date_of_visit = '31-Aug-04';
(iii) select name, count(*) from PHYSICIAN, VISIT where PHYSICIAN.regno = VISIT.regno group by Physician . regno;
(iv) This will provide the name of physicians who have not visited any patient.


Related Discussions:- Execute sql queries

Erds, What are the various symbols used to draw an E-R diagram (any 3)?

What are the various symbols used to draw an E-R diagram (any 3)?

Illustrate the class diagram for class room scheduling, Illustrate the clas...

Illustrate the class diagram for class room scheduling system If in any college, the number of classrooms are limited which have to be allocated to various classes and instruct

Hashing.., various techniques of hashing?

various techniques of hashing?

Stock market, need requirement analysis for database management of stock ma...

need requirement analysis for database management of stock market

What are the drawbacks of shadow-paging technique, What are the drawbacks o...

What are the drawbacks of shadow-paging technique? The drawbacks of shadow paging is:- a) Commit Overhead b) Data fragmentation c)  Garbage collection

Ideal data dictionary, An ideal data dictionary should have everything a DB...

An ideal data dictionary should have everything a DBA wants to know about the database. 1 Conceptual, External, and internal database descriptions. 2.    Descriptions of attr

Database administrator, The Database administrator (DBA) uses the data dict...

The Database administrator (DBA) uses the data dictionary in each phase of a database life cycle, beginning from the data gathering phase to the design, execution and maintenance p

BI, (a) Why did SAP introduce the extended star schema?

(a) Why did SAP introduce the extended star schema?

Why were functional methods fashionable in early days, Why were functional ...

Why were functional methods fashionable in early days? These are inspired directly by computer architecture and thus popular among computer scientist in early days. The divisio

Evaluate the bulleted list of information-related items, Critically evaluat...

Critically evaluate the bulleted list of information-related items in this case study. How are each contradictory to the notion of being an information-literate knowledge worker?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd