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

the papers at NIPS in 2015 using COCO dataset
SELECT DISTINCT paper.paperid FROM dataset, paper, paperdataset, venue WHERE dataset.datasetname = 'COCO' AND paperdataset.datasetid = dataset.datasetid AND paper.paperid = paperdataset.paperid AND paper.year = 2015 AND venue.venueid = paper.venueid AND venue.venuename = 'NIPS'
SELECT DISTINCT "paper"."paperid" FROM "dataset" JOIN "paperdataset" ON "dataset"."datasetid" = "paperdataset"."datasetid" JOIN "paper" ON "paper"."paperid" = "paperdataset"."paperid" AND "paper"."year" = 2015 JOIN "venue" ON "paper"."venueid" = "venue"."venueid" AND "venue"."venuename" = 'NIPS' WHERE "dataset"."datasetname" = 'COCO'