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

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'