CREATE TABLE `venue` (
  `venueId` integer NOT NULL
,  `venueName` varchar(100) DEFAULT NULL
,  PRIMARY KEY (`venueId`)
)

CREATE TABLE `author` (
  `authorId` integer NOT NULL
,  `authorName` varchar(50) DEFAULT NULL
,  PRIMARY KEY (`authorId`)
)

CREATE TABLE `dataset` (
  `datasetId` integer NOT NULL
,  `datasetName` varchar(50) DEFAULT NULL
,  PRIMARY KEY (`datasetId`)
)

CREATE TABLE `journal` (
  `journalId` integer NOT NULL
,  `journalName` varchar(100) DEFAULT NULL
,  PRIMARY KEY (`journalId`)
)

CREATE TABLE `keyphrase` (
  `keyphraseId` integer NOT NULL
,  `keyphraseName` varchar(50) DEFAULT NULL
,  PRIMARY KEY (`keyphraseId`)
)

CREATE TABLE `paper` (
  `paperId` integer NOT NULL
,  `title` varchar(300) DEFAULT NULL
,  `venueId` integer DEFAULT NULL
,  `year` integer DEFAULT NULL
,  `numCiting` integer DEFAULT NULL
,  `numCitedBy` integer DEFAULT NULL
,  `journalId` integer DEFAULT NULL
,  PRIMARY KEY (`paperId`)
,  FOREIGN KEY(`journalId`) REFERENCES `journal`(`journalId`)
,  FOREIGN KEY(`venueId`) REFERENCES `venue`(`venueId`)
)

CREATE TABLE `cite` (
  `citingPaperId` integer NOT NULL
,  `citedPaperId` integer NOT NULL
,  PRIMARY KEY (`citingPaperId`,`citedPaperId`)
,  FOREIGN KEY(`citedpaperId`) REFERENCES `paper`(`paperId`)
,  FOREIGN KEY(`citingpaperId`) REFERENCES `paper`(`paperId`)
)

CREATE TABLE `paperDataset` (
  `paperId` integer DEFAULT NULL
,  `datasetId` integer DEFAULT NULL
,  PRIMARY KEY (`datasetId`, `paperId`)
)

CREATE TABLE `paperKeyphrase` (
  `paperId` integer DEFAULT NULL
,  `keyphraseId` integer DEFAULT NULL
,  PRIMARY KEY (`keyphraseId`,`paperId`)
,  FOREIGN KEY(`paperId`) REFERENCES `paper`(`paperId`)
,  FOREIGN KEY(`keyphraseId`) REFERENCES `keyphrase`(`keyphraseId`)
)

CREATE TABLE `writes` (
  `paperId` integer DEFAULT NULL
,  `authorId` integer DEFAULT NULL
,  PRIMARY KEY (`paperId`,`authorId`)
,  FOREIGN KEY(`paperId`) REFERENCES `paper`(`paperId`)
,  FOREIGN KEY(`authorId`) REFERENCES `author`(`authorId`)
)
SELECT DISTINCT COUNT ( t1.paperid ) FROM venue AS t2 JOIN paper AS t1 ON t2.venueid  =  t1.venueid WHERE t1.year  =  2015 AND t2.venuename  =  "nature communications";
How many papers were accepted at nature communications 2015 ?