SQL crossword

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Across
  1. 7. primary key constraint
  2. 8. join that returns only "matching" rows
  3. 9. query
  4. 10. SQL affecting metadata
  5. 11. returns inner join result set plus unmatched rows
  6. 13. eliminate duplicate rows
  7. 17. primary keys cannot be ...
  8. 18. a delete rule
  9. 20. remove row
Down
  1. 1. one summary function
  2. 2. a type of constraint
  3. 3. used in the "order by" clause
  4. 4. SQL for modifying user data
  5. 5. modify metadata
  6. 6. select... from... _____ BY
  7. 8. add a row
  8. 12. modify rows
  9. 14. correlated or non correlated
  10. 15. function to get "number of rows"
  11. 16. SQL standards body
  12. 19. grants and revokes