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Handling answers that build heavily on (or are copied outright from) existing answers

I answered this question with an explanation and a block of code:

sql query for select statement

Someone else copied my code block exactly and pasted it into their own answer with just one minor change (they added a single word that may slightly improve efficiency), and didn't even explain their change. If I were them I would have just commented on my answer. But considering the way they did, is it acceptable? If not, would it be acceptable if they had copied my code, made the minor change, but also included an explanation in their answer of how efficiency plays into it?

In any case, I updated my answer adding the word to make it align with the more efficient version (and added an update note with an explanation and a hat-tip to the other answered). Was my change acceptable, given that I'm now in a sense copying their contribution?

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marked as duplicate by Time Traveling Bobby, ChrisF, Diago, Grant Thomas, Pops Mar 19 '12 at 14:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
Your change was acceptable, and you should probably throw an upvote SmartestVEGA's way... –  Yannis Mar 19 '12 at 9:32
    
@YannisRizos, good point. I upvoted them. –  Ben Lee Mar 19 '12 at 9:38
    
In general, I agree with the answers to the duplicate question. But in this particular case, that was just a little bit shady. I'd be a bit peeved, too, if I were you, considering that he didn't provide any sort of attribution. A comment would have probably been ideal, or even an edit to your answer, but I'd have settled for his answer containing a link to the original that he was modifying/building on. –  Cody Gray Mar 19 '12 at 16:45
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up vote 3 down vote accepted

My understanding is that it is better that the most upvoted answers are as good as they can be. Hence it was a good decision to update your answer - especially as you provided attribution.

For what it's worth, I would have commented about the advantages of ALL on your answer rather than provide a new answer.

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