Can we insert null value in foreign key?

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1. #first
2. #foreign
3. #explain
4. #parent
5. #remember
6. #simply
7. #might
8. #exist
9. #definition
10. #answer
11. #duplicate
12. #unique
13. #value
14. #table
15. #field
16. #different
17. #requires
18. #short