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We have a Question and Answer setup on Drupal. Question is a node. The answer is a comment.

What we are trying to do is to order Questions by either the latest asked question or by the latest commented question.

So when a new comment it posted, that questions moves on top. I can do it for Question or comments. But can't combine the two together.

Is there any way to achieve this?

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If you were building the SQL directly, you could do it in the ORDER BY clause with the CASE WHEN syntax where you do something like:

CASE WHEN comment_table.timestamp > node_table.timestamp then comment_table.timestamp else node_table.timestamp

Since there is no default Views core plugin for CASE WHEN sorting, you can either build a Views sort plugin that implements the syntax or use existing plugins that allow custom SQL with a notable security caveat that comes with storing code in your configuration.

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