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

what author is most cited ?
SELECT DISTINCT author.authorname, COUNT(cite.citingpaperid) FROM author, cite, writes WHERE writes.authorid = author.authorid AND writes.paperid = cite.citedpaperid GROUP BY author.authorname ORDER BY COUNT(cite.citingpaperid) DESC
SELECT DISTINCT "author"."authorname", COUNT("cite"."citingpaperid") FROM "author" JOIN "writes" ON "author"."authorid" = "writes"."authorid" JOIN "cite" ON "cite"."citedpaperid" = "writes"."paperid" GROUP BY "author"."authorname" ORDER BY COUNT("cite"."citingpaperid") DESC NULLS LAST