What is the difference between Oracle and PostgreSQL?

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1. #developed
2. #system
3. #editions
4. #which
5. #source
6. #available
7. #whereas
8. #different
9. #commercial
10. #relational
11. #object
12. #oracle
13. #programming
14. #management
15. #postgresql
16. #database
17. #language
18. #implemented