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saleks28

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Sep 23rd, 2020
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  1. SELECT Computer_System.Code
  2. FROM Computer_System
  3. WHERE NOT EXISTS
  4. (SELECT Software_Computer_System.CS_Code Code
  5. FROM Software_Computer_System INNER JOIN
  6. (SELECT Software.Code Codes
  7. FROM Software INNER JOIN Applications
  8. ON Software.Code=Applications.Code)
  9. ON Software_Computer_System.Software_Code=Codes WHERE Computer_System.Code=CS_Code);
  10.  
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