mysql demo parent and child, MySQL

mysql demo parent and child

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country
state

1
India
Tamilnadu

2
India
Karnataka

3
India
Kerala

4
Srilanka
columbu

5
Srilanka
columbu1


  
country
state

1
India
Tamilnadu

2
India
Karnataka

3
India
Kerala

4
Srilanka
columbu

5
Srilanka
columbu1

6
Tamilnadu
NULL

7
Karnataka
NULL

8
Kerala
NULL

9
columbu
NULL

10
columbu1
NULL

λ

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