Use page_id when parent_id is not set (no children yet)
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@ -16,7 +16,7 @@ SELECT
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p.page_id,
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p.page_id,
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--
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--
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(
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(
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SELECT MIN(g.parent_id)
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SELECT NVL(MIN(g.parent_id), MIN(g.page_id)) AS parent_id
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FROM g
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FROM g
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WHERE g.page_group = p.page_group
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WHERE g.page_group = p.page_group
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) AS parent_id,
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) AS parent_id,
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