saleks28

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Oct 13th, 2020
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MySQL 0.31 KB | None | 0 0
  1. SELECT Computer_System.Code
  2. FROM Computer_System
  3. WHERE NOT EXISTS
  4.     (SELECT Software_CS.Code_CS
  5.     FROM Software_CS INNER JOIN
  6.         (SELECT Software.Code Codes
  7.         FROM Software INNER JOIN Applications
  8.             ON Software.Code=Applications.Code)
  9.     ON Software_CS.Code_Software=Codes WHERE Computer_System.Code=Code_CS);
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