mysql - Selecting the data that isn't in a query -

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I want to select all those posts that are not marked as read by the user.

pre> user_id post_id 3 1 3 4

I want to select all the data that is not selected in this query 

  SELECT p. post_id, p.post_message FROM tbl_post as p LEFT JOIN tbl_mark_as_read AS r.post_id = p.post_id and r.user_id = 3   
 I want to be like output  
  post_id post_message 2 goodnight 3 good morning cool    
 
 
 you can not  not in  op RATER:  
  SELECT * fROM tbl_post Do not post in the WHERE (SELECT post_id FROM tbl_mark_as_read);   
 If you want to exclude only the post whose user has read 3, you can add a  where  section to the internal query:  
  SELECT * fROM tbl_post WHERE do not post_in (SELECT post_id FROM tbl_mark_as_read WHERE user_id = 3);

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