Joining three tables in SQL -

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I have three tables 

  file - file ID (PK), code, & Amp; Description hierarchy - File ID (fk), Folder ID (FK), Folder's (PK) folder - Folder ID (PK), Folder Name   
 In the hierarchy table, the file ID will be empty for the folder and the folder ID will be empty for a file  
 I do not get any results from this query  
  SELECT File.fileId, File.code, File Description, Hierarchy.folderId, Hierarchy .folderKey, File.fileId = Hierarchy.fileId file from the hierarchy attached to the File Inner file. Include a folder on the hierarchy in the folder. Folder ID = Folder. Folder ID   
 No clue << P> 
  
 
  
 
 
 Does this work?  
  Add SELECT File.fileId, File.code, File.description, Hierarchy.folderId, Hierarchy.folderKey, from file to file folder. File = file on File = hierarchy.fileId folder on the left Join hierarchy. Folder = folder.foulder iid

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