sql - Get reply numbers in mysql -

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I am working on a product review page where it has been submitted for many submissions Will display the number of comments.

I thought 

  as the title of review_title, COUNT (id_group) Approved_reply_number where approved and I can use as lt; & Gt; '0' Group by ID_ Group '  
 But read it that it is not possible to copy the ID values ​​to the second line in the process of inserting any review,  if presented id_group  field to be left blank for review  
 here:.  
  CREATE TABLE product_review (`id`int,` title 'varchar (21), `id_group` int,` valid` int); The value (1, 'AAA', Null, 1), (2, 'BBB', 1,1), (3, 'CCC') in the product_review (`id`,` title`, `id_group`,` approved`) ', Tap, 1), (4,' DDD ', 3,0), (5,' EE ', 1,1), (6,' FFF ', null, 1), (7,' ggji '6 , 1), (8, 'HHH', 1,1), (9, 'III', 6, 1);   
 Those who have tap into  id_group  are the submitted reviews, the rest are answers and their respective reviews have an ID. I was wondering how can I get an output like this:  
  review_title approved_reply_number AAA3CCC0FFF2    
 < Div class = "post text" itemprop = "text"> 
 You can join a self and use the counting query with the group> select and also to filter out an outside review where the segment only  
  Haha Given

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