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Left Join

  
      

      

      
      

      

      Capitals
      

      

      Country         
      Capital         
      

      

      India
      New Delhi
      

      

      USA
      Washington
      

      

      France
      Paris
      

      

      		
      
      
      
      

      

      Continents
      

      

      Country     
      Continent   
      

      

      India
      Asia
      

      

      USA
      N.America
      

      

      Italy
      Europe
      

      

      		
      

      

    
      
 ---- Returns all the rows from the first Table, even if there are no matches in the second Table. 

      
      SELECT      Capitals.*, Continents.Continent
      FROM        Capitals
      LEFT JOIN   Continents
      ON          Capitals.Country=Continents.Country
    
      

      

      Output
      

      

      Country     
      Capital     
      Continent   
      

      

      India
      New Delhi
      Asia
      

      

      USA
      Washington
      N.America
      

      

      France
      Paris
      NULL