sql - Return the maximum of all groups? -

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Consider a simple table like the following table: 

  create table example example_groups ( Id SERIAL primary key is not value1 INT, value is not 2 INT, not user_name text tap);   
 with some lines in it:  
  Example group_subjects (value1, value2, user_name) values ​​(3, 1, 'Tom'); Examples include example_groups (value1, value2, user_name) in values ​​(5, 2, 'tom'); Example in the example group (value 1, value2, user_name) value (1, 3, 'tom'); Example in the example group (value 1, value2, user_name) value (40, 10, 'john'); Example - include in groups (value 1, value2, username_name) (1, 11, 'John');   
 I have the following query for the group in the table by SELECT SUM (value1),  user_name  column:   Value 2), maximum (value 2) example_groups GROUP by user_name;   
 Return of the result I'm going to put it in another table (the query is  INSERT SELECT )  
 I get my code named  I want to return to the maximum value of all the rows in the MAX  column. So far, I am doing this with a  returning  statement, although when I try to use it, I get an error.  
 What is the correct way to use  Returning  statement in this scenario?  
 Example of an unsuccessful query:  
  SEUP SUM (value1), SUM (value2), MAX (value2) AS max2, GROUP from the example_groups returning (MAX (max2)) User_name;   
 Ps I'm using postgrads.  
  
 
 
 also sum1 as SELECT SUM (value1), SUM (value2) ) As sum1, max (value2) as maxValue2, example_groups GROUP BY user_name) * whistle * maximum * = (select max) Choose whistle (maxValue2)   
 With sum1, SUM (value2) sum1, MAX (value2) as the SELECT SUM (value1), as in max_value2 example_groups GROUP by user_name) max_Of_all whistle with 
  Select Max (maxValue2) from   
     
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