为什么不简单地：
SELECt level, * FROM accounts START WITH parent_account_id = account_id ConNECT BY PRIOR account_id = parent_account_id AND account_id <> parent_account_id
？
为什么不简单地：
SELECt level, * FROM accounts START WITH parent_account_id = account_id ConNECT BY PRIOR account_id = parent_account_id AND account_id <> parent_account_id
？
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