เอกสารใดที่ Clifford Grobstein ตีพิมพ์ในวารสาร Science ไม่จำเป็นต้องใช้ตารางทั้งหมด
what paper has Clifford Grobstein published in Science ?It is not neccessary to use all the tables.
 field:  fieldid [ int] 
SELECT DISTINCT paper.paperid FROM author, paper, venue, writes WHERE author.authorname = 'Clifford Grobstein' AND venue.venueid = paper.venueid AND venue.venuename = 'Science' AND writes.authorid = author.authorid AND writes.paperid = paper.paperid