SQL : Group rows by dense_rank() and loop through each sub-group and compare another column in next

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SQL : Group rows by dense_rank() and loop through each sub-group and compare another column in next row of that sub group?
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SQL : Group rows by dense_rank() and loop through each sub-group and compare another column in next row of that sub group?
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Group rows : sub dense_rank() another each column next compare group? in SQL through that and row and of loop sub-group by