What is not null in SQL?

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Tags

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