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

how is the most cited author in ACL ?
SELECT DISTINCT COUNT(DISTINCT cite.citingpaperid), writes.authorid FROM cite, paper, venue, writes WHERE venue.venueid = paper.venueid AND venue.venuename = 'ACL' AND writes.paperid = cite.citedpaperid AND writes.paperid = paper.paperid GROUP BY writes.authorid ORDER BY COUNT(DISTINCT cite.citingpaperid) DESC
SELECT DISTINCT COUNT(DISTINCT "cite"."citingpaperid"), "writes"."authorid" FROM "cite" JOIN "writes" ON "cite"."citedpaperid" = "writes"."paperid" JOIN "paper" ON "paper"."paperid" = "writes"."paperid" JOIN "venue" ON "paper"."venueid" = "venue"."venueid" AND "venue"."venuename" = 'ACL' GROUP BY "writes"."authorid" ORDER BY COUNT(DISTINCT "cite"."citingpaperid") DESC