PL/SQL Hierarchical Query - Select Data In Specific Way

Apr 19, 2013

I have a table that has hierarchical data within it. I need to select this data in a specific way, showing the hierarchy.

E.g. Data in table (Key is unique)

Lvl KeyParKey HasChild
1k101
1k200
1k301
1k401
2k34k10
2k22k11
2k24k10
2k13k30
2k52k30
2k35k30
2k13k30
2k11k40
3k56k220
3k109k221
3k67k220
4k61 k1090
Etc etc....

That�s generally the format the values would appear in the table if I just did a standard select. I want it displayed in a more hierarchical Parent � child way.

The format I need to get out is as follows:
Lvl KeyParKey hasCh
1k101
2k34k10
2k22k11
3k56k220
3k109k221
4k61 k1090
3k67k220
2k24k10
1k200
1k301
2k13k30
2k52k30
2k35k30
2k13k30
1k401
2k11k40

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Here is my case,

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4     8     12
4     9     13
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