Intersection with MySQL with queries -

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I am trying to repeat two queries in MySQL in this query: 

  SELECT user_id FROM post group select thread_ID HAVING COUNT (thread_ID) = 1 intersect from user_id from user_id; Group post (user_id) = 1 since URI_ID;   
 I've discovered ways to do this in MySQL, but unfortunately I did not work for me using IN and INNER JOIN.  
 I have to work with test data:  
  Post post (post_member, timestamp, user_id, thread_id) value (0,0,1,1000); Post in post (post_member, timestamp, user_id, thread_id) value (0, 02, 2000); Post in post (post_member, timestamp, user_id, thread_id) value (0,0,3,2000); Post in post (post_member, timestamp, user_id, thread_id) value (0,04,3000); Post in post (post_member, timestamp, user_id, thread_id) value (0,0,5,4000); Post in post (post_member, timestamp, user_id, thread_id) value (0,0,1,4000);   
 To run the spacing of two of my questions  
  4   
 Any help is appreciated Thank you.   
 
 
 In postgres I will like it  
  SELECT user_id by post Where Thread_ID (Thread_ID by Thread_ID) Select Thread_ID from post group by thread_id (c) = 1) Select intersect; URI post (user_id) = 1 by URI_ID from user_id; However, apparently, mysql does not support intersection, so an internal would be sufficient:  
  SELECT post.user_id to join the post From (SELECT user_id FROM, user_id with user_id by user_id = 1) x x.user_id = post.user_id where in thread post by thread_id (select thread_id if thread_id is counted (specific user_id) = 1)   
 Both of those return 4

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