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What is the point of tagging a question with both a parent and a child tag?
On the old sites, if you wanted to tag something with [sql] and [mysql] that required two tags. However, because we have hierarchal tags where [mysql] is a child of [sql] you only need to tag it with [mysql] to have it come up in the search for the [sql] tag.
I am wondering what the use case here would be for tagging it with both as it will show up in the search by tag for both [sql] and [mysql] either way.
Personally, I think it would be cleaner if only one tag from a grandparent->parent->child relationship was used on a question.
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I can provide an answer based on Stack Overflow experience. SO offered watches by tags. By using a general tag along with a more specific tag, users interested in [sql] will also get the question in their feed.
While I could find this feature on Codidact, it makes sense to implement it in the future, when the question volume justifies this type of notification (by tags).
An answer on a related Meta suggestion, Remove parent tags from a post where a child tag is present, provides a case where you might want to tag both.
For example, if mammal is a parent of deer, but a question is about how non-deer mammals in general and deer in particular get along with one another, you'd probably want both tags.
In general, however, there isn't any need to tag both. I don't see the harm in doing so though. And personally, I kind of like having the tag list "fully qualified" so to speak, though I understand why you think otherwise.
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Tags also serve for someone who stumbles across the question directly from a third party link to find related content. Perhaps the child tag would suffice if the parent tag is automatically inserted in the page.
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