SophiaPretty

(5)

$14/per page/Negotiable

About SophiaPretty

Levels Tought:
Elementary,Middle School,High School,College,University,PHD

Expertise:
Accounting,Algebra See all
Accounting,Algebra,Applied Sciences,Architecture and Design,Art & Design,Biology,Business & Finance,Calculus,Chemistry,Communications,Computer Science,Economics,Engineering,English,Environmental science,Essay writing Hide all
Teaching Since: Jul 2017
Last Sign in: 304 Weeks Ago, 5 Days Ago
Questions Answered: 15833
Tutorials Posted: 15827

Education

  • MBA,PHD, Juris Doctor
    Strayer,Devery,Harvard University
    Mar-1995 - Mar-2002

Experience

  • Manager Planning
    WalMart
    Mar-2001 - Feb-2009

Category > Computer Science Posted 20 Dec 2017 My Price 10.00

Here is the schema for POP: JOURNALS(j_num, j_name

Here is the schema for POP:

JOURNALS(j_num, j_name, j_subject_area, chief_editor_r_ssn[1])

chief_editor_rssn FK REF Researchers

 

ISSUES(j_num, i_num, i_date, i_num_pages)

j_num FK REF journals

 

RESEARCHERS(r_ssn, r_name, r_address, r_phone, r_institution)

 

ARTICLES(art_num, art_title, art_area_topic, art_abstract, j_num_submitted,date_submitted,

j_num_published, i_num_published)

j_num_submitted FK REF journals

(j_num_published,i_num) FK REF issues

 

AREA_EDITS(j_num, r_ssn)

j_num FK REF journals

r_ssn FK REF researchers

 

WRITES(r_ssn, art_num)

r_ssn FK REF researchers

art_num FK REF articles

 

REVIEWS(r_ssn, art_num)

r_ssn FK REF researchers

art_num FK REF articles

 

RESEARCH_SPECIALTIES(r_spec_name)

 

RRS(r_ssn, r_spec_name)

r_ssn FK REF researchers

spec_name FK REF research_specialties

 

 

Write SQL statements to answer the following queries.

a)    The name of the journal with the maximum number of area-editors.

b) The number of area editors for the journal in which article number 5471 appeared.

c)    The number of journals for which researcher ‘Albert Einstein’ is the chief editor.

d)   The average number of articles written by researchers at TU. 

e) The article area topic that has the maximum number of articles

[1] The chief_editor_r_ssn is the r_ssn of the researcher who is chief editor for the journal. 

 

Answers

SophiaPretty
(5)
Status NEW Posted 20 Dec 2017 02:12 PM My Price 10.00

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