demo, Sql Server - rextester

demo

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View schema
Execution time: 0 sec, rows selected: 9, rows affected: 0, absolute service time: 0,19 sec

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Account_Number
Parent_Account
Child_Account
pos

1
R000355
NULL
R003247
1

2
R003247
R000355
R000002
1

3
R000002
R003247
NULL
1

4
R004853
NULL
R028636
2

5
R004853
NULL
R028638
2

6
R004853
NULL
R028637
2

7
R028637
R004853
NULL
2

8
R028638
R004853
NULL
2

9
R028636
R004853
NULL
2

λ

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