Does primary key imply NOT NULL?

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Tags

1. #standard
2. #constraints
3. #always
4. #based
5. #columns
6. #unlike
7. #other
8. #imply
9. #check
10. #level
11. #decided
12. #values
13. #primary
14. #define
15. #column
16. #allow
17. #therefore
18. #should
19. #table