CREATE TABLE paperdataset (paperid NUMBER, datasetid NUMBER)
CREATE TABLE keyphrase (keyphraseid NUMBER, keyphrasename VARCHAR2)
CREATE TABLE cite (citingpaperid NUMBER, citedpaperid NUMBER)
CREATE TABLE field (fieldid NUMBER)
CREATE TABLE writes (paperid NUMBER, authorid NUMBER)
CREATE TABLE paper (paperid NUMBER, title VARCHAR2, venueid NUMBER, year NUMBER, numciting NUMBER, numcitedby NUMBER, journalid NUMBER)
CREATE TABLE journal (journalid NUMBER, journalname VARCHAR2)
CREATE TABLE author (authorid NUMBER, authorname VARCHAR2)
CREATE TABLE dataset (datasetid NUMBER, datasetname VARCHAR2)
CREATE TABLE venue (venueid NUMBER, venuename VARCHAR2)
CREATE TABLE paperkeyphrase (paperid NUMBER, keyphraseid NUMBER)
CREATE TABLE paperfield (fieldid NUMBER, paperid NUMBER)

what are commonly cited papers by tom mitchell and oren etzioni ?
SELECT DISTINCT author.authorname, cite.citedpaperid, COUNT(cite.citedpaperid) FROM author, cite, paper, writes WHERE author.authorname IN ('tom mitchell', 'oren etzioni') AND paper.paperid = cite.citedpaperid AND writes.authorid = author.authorid AND writes.paperid = paper.paperid GROUP BY cite.citedpaperid, author.authorname ORDER BY COUNT(cite.citedpaperid) DESC
SELECT DISTINCT "author"."authorname", "cite"."citedpaperid", COUNT("cite"."citedpaperid") FROM "author" CROSS JOIN "cite" JOIN "paper" ON "cite"."citedpaperid" = "paper"."paperid" JOIN "writes" ON "author"."authorid" = "writes"."authorid" AND "paper"."paperid" = "writes"."paperid" WHERE "author"."authorname" IN ('tom mitchell', 'oren etzioni') GROUP BY "cite"."citedpaperid", "author"."authorname" ORDER BY COUNT("cite"."citedpaperid") DESC