oracle - Fetch all parents and children with "connect by" query for a particular input in sql -

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i have table com_customer_mst, contains customer_id , parent_customer_id, need fetch parents , children particular customer_id input. 1 customer_id have single parent have multiple children.

i have run query:

select customer_id, customer_code, parent_customer_id sbsa_axia.com_customer_mst start customer_id = 154   connect prior customer_id = parent_customer_id;

but giving children.

customer_id     parent_customer_id 61              12 18              12 111             12 250             12 14              15


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