What is null in database?

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  1. #marker
  2. #reserved
  3. #database
  4. #relational
  5. #value
  6. #indicate
  7. #query
  8. #confused
  9. #special
  10. #structured
  11. #creator
  12. #introduced
  13. #identify
  14. #language
  15. #model
  16. #should
  17. #exist