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

What are the latest papers by Nigam H. Shah and Srinivasan Iyer ?
SELECT DISTINCT paper.year, writes.paperid FROM author, paper, writes WHERE author.authorname IN ('Nigam H. Shah', 'Srinivasan Iyer') AND writes.authorid = author.authorid AND writes.paperid = paper.paperid GROUP BY writes.paperid HAVING COUNT(DISTINCT writes.authorid) = 2 ORDER BY paper.year DESC
SELECT DISTINCT "paper"."year", "writes"."paperid" FROM "author" JOIN "writes" ON "author"."authorid" = "writes"."authorid" JOIN "paper" ON "paper"."paperid" = "writes"."paperid" WHERE "author"."authorname" IN ('Nigam H. Shah', 'Srinivasan Iyer') GROUP BY "writes"."paperid" HAVING COUNT(DISTINCT "writes"."authorid") = 2 ORDER BY "paper"."year" DESC NULLS LAST