php - Join table rows by GROUP_CONCAT , failed! It's not working? -

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I do not know why this is not working.

I have a table with "resume" id from "SELECT id GROUP_CONCAT (SKILLS) SEPARATOR ','); It starts again, then two field IDs and skills it returns an error like this: 

  Error: There is an error in your SQL syntax; On line '1' / Code>  
 Resume_Check your manual for the right syntax to use near 'GROUP_CONCAT (skill SEPARATOR', '') from the school group.   
 
 
 between the id and the group you miss the coma (,).  
 From the correct     id  
  SELECT id, GROUP_CONCAT (skill SEPARATOR ',')

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