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

When does Michael Stonebraker publish the first VLDB paper ?
SELECT DISTINCT paper.year FROM author, paper, venue, writes WHERE author.authorname = 'Michael Stonebraker' AND venue.venueid = paper.venueid AND venue.venuename = 'VLDB' AND writes.authorid = author.authorid AND writes.paperid = paper.paperid ORDER BY paper.year
SELECT DISTINCT "paper"."year" FROM "author" JOIN "writes" ON "author"."authorid" = "writes"."authorid" JOIN "paper" ON "paper"."paperid" = "writes"."paperid" JOIN "venue" ON "paper"."venueid" = "venue"."venueid" AND "venue"."venuename" = 'VLDB' WHERE "author"."authorname" = 'Michael Stonebraker' ORDER BY "paper"."year"