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Sql query to retrieve records in parent sibling relationship in a table

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I need help to write this Sql query on a table where it has the primary_id, parent_id, and sibling_id. A new row can be created with or without the parent_id and sibling_id. However most of the new rows are created from an existing row and the primary_id of the existing row is inserted to the parent_id of the new row. This can go on for many many rows such as (B's parent_id has A primary_id, A's sibling_id has B primary_id), (C's parent_id has B primary_id, B's sibling_id has C primary_id), (D's parent_id has C primary_id, C's sibling_id has D primary_id), What I want is when user pass on a primary_id on a row, the query will give me back all the related parent_id or sibling_id records. For example User pass the A's primary_id the query will give me back the Row B and Row C as a sibling rows or user pass the C's primary_id the query should give me back row B and Row A as parent rows. Thanks

Kahlua


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