What null means MySQL?

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Tags

1. #record
2. #without
3. #values
4. #constraint
5. #adding
6. #always
7. #which
8. #insert
9. #update
10. #default
11. #contain
12. #cannot
13. #column
14. #enforces
15. #means
16. #field
17. #value
18. #accept