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

I want the co-authors of papers on Machine Translation Output with Philipp Koehn
SELECT DISTINCT AUTHOR_1.authorid FROM author AS AUTHOR_0, author AS AUTHOR_1, keyphrase, paperkeyphrase, writes AS WRITES_0, writes AS WRITES_1 WHERE AUTHOR_0.authorname = 'Philipp Koehn' AND keyphrase.keyphrasename = 'Machine Translation Output' AND paperkeyphrase.keyphraseid = keyphrase.keyphraseid AND WRITES_0.authorid = AUTHOR_0.authorid AND WRITES_0.paperid = paperkeyphrase.paperid AND WRITES_1.authorid = AUTHOR_1.authorid AND WRITES_1.paperid = WRITES_0.paperid
SELECT DISTINCT "AUTHOR_1"."authorid" FROM "author" AS "AUTHOR_0" JOIN "keyphrase" ON "keyphrase"."keyphrasename" = 'Machine Translation Output' JOIN "paperkeyphrase" ON "keyphrase"."keyphraseid" = "paperkeyphrase"."keyphraseid" JOIN "writes" AS "WRITES_0" ON "AUTHOR_0"."authorid" = "WRITES_0"."authorid" AND "WRITES_0"."paperid" = "paperkeyphrase"."paperid" JOIN "writes" AS "WRITES_1" ON "WRITES_0"."paperid" = "WRITES_1"."paperid" JOIN "author" AS "AUTHOR_1" ON "AUTHOR_1"."authorid" = "WRITES_1"."authorid" WHERE "AUTHOR_0"."authorname" = 'Philipp Koehn'