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Use Parameterized Queries

  

      

      EMP
      

      

      ID      
      Name    
      Country 
      Salary 
      

      

      1
      Vijay
      India
      6000
      

      

      2
      Bill
      USA
      8000
      

      

      3
      Kris
      France
      3000
      

      

    
 ----  Low Performance by selecting all rows

      SELECT * FROM EMP




 ----  High Performance by selecting required rows using Filters

      SELECT Country FROM EMP WHERE Salary > 5000