Why Union all is faster than union?

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Tags

  1. #insures
  2. #table
  3. #tables
  4. #adding
  5. #distinct
  6. #combines
  7. #another
  8. #record
  9. #single
  10. #union
  11. #records
  12. #faster
  13. #joins
  14. #vertically
  15. #horizontally
  16. #combine
  17. #columns