mysql - #1064-error in sql syntax -

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I am trying to validate a user through my user name and password through a mySQL process < / p> 

  Delimiter // validate function_gator (username, password_1) return char (1) start the DETERMistimate reserved rate (1); If present (select * from logificable where userid = username_1 and password = password_1) then set = '1'; end if; Retrace; the ending; // Delimiter;   
 But I'm getting error # 1064 error in SQL syntax.   
 
 
  return char (1)

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