mysql - where clause in inner join query -

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Please help me about this question: 

  Look for functions ($ userpno) } {Echo $ userpno; $ This-> query = "SELECT task.employee_id, task.user_id, task.service_id, service.name AS servicename, service.description AS servicedescription, employee.name as employineame, employee.pic_path employment, employee.pic_path from work Work.user_id = '$ userpno' Join the INNER employee. Pno = task.employee_id Join INNER user user.pno = task.user_id service.service_id = task.service_id "INNER service; }   
 query works perfectly without:  
  WHERE task.user_id = '$ userpno'   
 my Also try this method:  
  WHERE task.user_id = $ userpno   
 but it does not work.  
 Error:  
  Warning: mysqli_fetch_array () parameter 1 is expected to be mysqli_result, given in Boolean C: \ wamp \ www \ admin \ classes \ Task Php on line 22   
 Please tell me where I say where is it.   
 
 
 Try:  
  $ this-> query = "SELECT Task.employee_id, task.user_id, task.service_id, service.name AS servicename, service.description AS SERVISCESCRIPTION, employee.name AS employineame, employee.pic_path AS Employ.pict_path, join employee pic_path employee employee pno = task Add a user to .employee_id INNER user.pno = task.user_id service.service_id = task.service_id on the INNER service where work.user_id = '$ userpno' ";

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