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

Does Jeffrey Heer have more papers than Luke S Zettlemoyer ?
SELECT DISTINCT author.authorname, COUNT(writes.paperid) FROM author, writes WHERE author.authorname IN ('Jeffrey Heer', 'Luke S Zettlemoyer') AND writes.authorid = author.authorid GROUP BY author.authorname ORDER BY COUNT(writes.paperid) DESC
SELECT DISTINCT "author"."authorname", COUNT("writes"."paperid") FROM "author" JOIN "writes" ON "author"."authorid" = "writes"."authorid" WHERE "author"."authorname" IN ('Jeffrey Heer', 'Luke S Zettlemoyer') GROUP BY "author"."authorname" ORDER BY COUNT("writes"."paperid") DESC