php - Can't update row in database -

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I try to update a line in the database, but I can not do this Here's my SQL: 

  $ sql = "UPDATE` voter_name_imount_tount` SET` volume` = quantity + 1 where` tender` = '$ nid' and nominee = '$ named'; " ;   
 I suspect that the problem is here -  and the nominee = '$ Named' '';  Because when I remove all functions and updates from the query correctly, please help.   
 
 
 Try this:  
  $ sql = "UPDATE voting_nomination_counter set quantity = Quantity + 1 Where Nadil = '$ Nid' and nominee = '$ Nominated' '' ';

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