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

what datasets did oren etzioni use in his papers ?
SELECT DISTINCT paperdataset.datasetid FROM author, paper, paperdataset, writes WHERE author.authorname = 'oren etzioni' AND paper.paperid = paperdataset.paperid AND writes.authorid = author.authorid AND writes.paperid = paper.paperid
SELECT DISTINCT "paperdataset"."datasetid" FROM "author" JOIN "writes" ON "author"."authorid" = "writes"."authorid" JOIN "paper" ON "paper"."paperid" = "writes"."paperid" JOIN "paperdataset" ON "paper"."paperid" = "paperdataset"."paperid" WHERE "author"."authorname" = 'oren etzioni'