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Jul 19th, 2019
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  1. A|m | f B|m | f
  2. a1 1 b1 1
  3. a2 2 b2 3
  4. a3 3 b3 5
  5.  
  6. SELECT a1, a2, b1, b2
  7. FROM A
  8. INNER JOIN B on B.f = A.f
  9.  
  10. |m| A.f B.f |m|
  11. a1 1 1 b1
  12. a3 3 3 b2
  13.  
  14. A|m | f B|m | f
  15. a1 1 b1 a
  16. a2 2 b2 b
  17. a3 3 b3 c
  18.  
  19. |m| A.f B.f |m|
  20. a1 1 a b1
  21. a3 3 c b2
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