Quadcap Embeddable Database

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intervalSingleField
  :  (  "year" 
    |  "month" 
    |  "day" 
    |  "hour" 
    |  "minute" 
    ) 
    (  LPAREN integer RPAREN 
    |  
    ) 
    
  |  "second" 
    (  LPAREN integer 
      (  COMMA integer 
      |  
      ) 
      RPAREN 
    |  
    ) 
    
  ;