hierarchy - java convert hierarchical to flat data

Question

Let's say we have a RDBMS Table like below.

id	name	parentId
1	Computer	0
2	SmartDevice	0
3	CPU	1
4	Apple	2
5	Intel	3
6	AMD	3
7	iPhone	4
8	iPad	4
9	iPhone11	7
10	iPhone12	7

question from:https://stackoverflow.com/questions/65883620/java-convert-hierarchical-to-flat-data

Answer 1

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